scala.collection.mutable

# ListBuffer

#### final class ListBuffer[A] extends AbstractBuffer[A] with Buffer[A] with GenericTraversableTemplate[A, ListBuffer] with BufferLike[A, ListBuffer[A]] with Builder[A, immutable.List[A]] with SeqForwarder[A] with java.io.Serializable

A `Buffer` implementation back up by a list. It provides constant time prepend and append. Most other operations are linear.

A

  the type of this list buffer's elements.

Annotations
  @SerialVersionUID()
Version

  2.8

Since

  1

See also

  "Scala's Collection Library overview" section on `List Buffers` for more information.

Linear Supertypes
java.io.Serializable, SeqForwarder[A], IterableForwarder[A], TraversableForwarder[A], Builder[A, immutable.List[A]], AbstractBuffer[A], Buffer[A], BufferLike[A, ListBuffer[A]], Subtractable[A, ListBuffer[A]], Scriptable[A], Shrinkable[A], Growable[A], Clearable, AbstractSeq[A], Seq[A], SeqLike[A, ListBuffer[A]], Cloneable[ListBuffer[A]], scala.Cloneable, java.lang.Cloneable, Iterable[A], Traversable[A], Mutable, collection.AbstractSeq[A], collection.Seq[A], collection.SeqLike[A, ListBuffer[A]], GenSeq[A], GenSeqLike[A, ListBuffer[A]], PartialFunction[Int, A], (Int) ⇒ A, collection.AbstractIterable[A], collection.Iterable[A], IterableLike[A, ListBuffer[A]], Equals, GenIterable[A], GenIterableLike[A, ListBuffer[A]], AbstractTraversable[A], collection.Traversable[A], GenTraversable[A], GenericTraversableTemplate[A, ListBuffer], TraversableLike[A, ListBuffer[A]], GenTraversableLike[A, ListBuffer[A]], Parallelizable[A, ParSeq[A]], TraversableOnce[A], GenTraversableOnce[A], FilterMonadic[A, ListBuffer[A]], HasNewBuilder[A, scala.collection.mutable.ListBuffer[A] @scala.annotation.unchecked.uncheckedVariance], AnyRef, Any
Type Hierarchy Learn more about scaladoc diagrams
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1. Alphabetic
2. By inheritance

Inherited

1. ListBuffer
2. Serializable
3. SeqForwarder
4. IterableForwarder
5. TraversableForwarder
6. Builder
7. AbstractBuffer
8. Buffer
9. BufferLike
10. Subtractable
11. Scriptable
12. Shrinkable
13. Growable
14. Clearable
15. AbstractSeq
16. Seq
17. SeqLike
18. Cloneable
19. Cloneable
20. Cloneable
21. Iterable
22. Traversable
23. Mutable
24. AbstractSeq
25. Seq
26. SeqLike
27. GenSeq
28. GenSeqLike
29. PartialFunction
30. Function1
31. AbstractIterable
32. Iterable
33. IterableLike
34. Equals
35. GenIterable
36. GenIterableLike
37. AbstractTraversable
38. Traversable
39. GenTraversable
40. GenericTraversableTemplate
41. TraversableLike
42. GenTraversableLike
43. Parallelizable
44. TraversableOnce
45. GenTraversableOnce
46. FilterMonadic
47. HasNewBuilder
48. AnyRef
49. Any

Implicitly

1. by CollectionsHaveToParArray
2. by MonadOps
3. by any2stringadd
4. by StringFormat
5. by Ensuring
6. by ArrowAssoc
7. by alternateImplicit

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1. Public
2. All

### Instance Constructors

1. #### new ListBuffer()

### Type Members

1. #### type Self = ListBuffer[A]

   The type implementing this traversable

   The type implementing this traversable

   Attributes
     protected[this]
   Definition Classes
     TraversableLike

2. #### class WithFilter extends FilterMonadic[A, Repr]

   A class supporting filtered operations.

### Value Members

1. #### final def !=(arg0: Any): Boolean

   Definition Classes
     AnyRef → Any

2. #### final def ##(): Int

   Definition Classes
     AnyRef → Any

3. #### def +(other: String): String

   Implicit information
     This member is added by an implicit conversion from ListBuffer[A] to any2stringadd[ListBuffer[A]] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd

4. #### def ++(xs: GenTraversableOnce[A]): ListBuffer[A]

   Creates a new collection containing both the elements of this collection and the provided traversable object.

   Creates a new collection containing both the elements of this collection and the provided traversable object.

   xs

     the traversable object.

   returns

     a new collection consisting of all the elements of this collection and `xs`.

   Definition Classes
     BufferLike
   Annotations
     @migration
   Migration

     (Changed in version 2.8.0) `++` creates a new buffer. Use `++=` to add an element from this buffer and return that buffer itself.

5. #### def ++[B](that: GenTraversableOnce[B]): ListBuffer[B]

   [use case] Returns a new list buffer containing the elements from the left hand operand followed by the elements from the right hand operand.

   [use case]

   Returns a new list buffer containing the elements from the left hand operand followed by the elements from the right hand operand. The element type of the list buffer is the most specific superclass encompassing the element types of the two operands.

   Example:

       scala> val a = List(1)
       a: List[Int] = List(1)

       scala> val b = List(2)
       b: List[Int] = List(2)

       scala> val c = a ++ b
       c: List[Int] = List(1, 2)

       scala> val d = List('a')
       d: List[Char] = List(a)

       scala> val e = c ++ d
       e: List[AnyVal] = List(1, 2, a)

   B

     the element type of the returned collection.

   that

     the traversable to append.

   returns

     a new list buffer which contains all elements of this list buffer followed by all elements of `that`.

   Definition Classes
     TraversableLike → GenTraversableLike
   Full Signature

   #### def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

6. #### def ++:[B >: A, That](that: collection.Traversable[B])(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

   As with `++`, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

   As with `++`, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

   It differs from `++` in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.

   Example:

       scala> val x = List(1)
       x: List[Int] = List(1)

       scala> val y = LinkedList(2)
       y: scala.collection.mutable.LinkedList[Int] = LinkedList(2)

       scala> val z = x ++: y
       z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)

   This overload exists because: for the implementation of `++:` we should reuse that of `++` because many collections override it with more efficient versions.

   Since `TraversableOnce` has no `++` method, we have to implement that directly, but `Traversable` and down can use the overload.

   B

     the element type of the returned collection.

   That

     the class of the returned collection. Where possible, `That` is the same class as the current collection class `Repr`, but this depends on the element type `B` being admissible for that class, which means that an implicit instance of type `CanBuildFrom[Repr, B, That]` is found.

   that

     the traversable to append.

   bf

     an implicit value of class `CanBuildFrom` which determines the result class `That` from the current representation type `Repr` and and the new element type `B`.

   returns

     a new collection of type `That` which contains all elements of this traversable collection followed by all elements of `that`.

   Definition Classes
     TraversableLike

7. #### def ++:[B](that: TraversableOnce[B]): ListBuffer[B]

   [use case] As with `++`, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

   [use case]

   As with `++`, returns a new collection containing the elements from the left operand followed by the elements from the right operand.

   It differs from `++` in that the right operand determines the type of the resulting collection rather than the left one. Mnemonic: the COLon is on the side of the new COLlection type.

   Example:

       scala> val x = List(1)
       x: List[Int] = List(1)

       scala> val y = LinkedList(2)
       y: scala.collection.mutable.LinkedList[Int] = LinkedList(2)

       scala> val z = x ++: y
       z: scala.collection.mutable.LinkedList[Int] = LinkedList(1, 2)

   B

     the element type of the returned collection.

   that

     the traversable to append.

   returns

     a new list buffer which contains all elements of this list buffer followed by all elements of `that`.

   Definition Classes
     TraversableLike
   Full Signature

   #### def ++:[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

8. #### def ++=(xs: TraversableOnce[A]): ListBuffer.this.type

   Appends all elements produced by a TraversableOnce to this list buffer.

   Appends all elements produced by a TraversableOnce to this list buffer.

   xs

     the TraversableOnce producing the elements to append.

   returns

     the list buffer itself.

   Definition Classes
     ListBuffer → Growable

9. #### def ++=:(xs: TraversableOnce[A]): ListBuffer.this.type

   Prepends elements to this buffer.

   Prepends elements to this buffer.

   xs

     the TraversableOnce containing the elements to prepend.

   returns

     the buffer itself.

   Definition Classes
     ListBuffer → BufferLike

10. #### def +:(elem: A): ListBuffer[A]

    [use case] A copy of the list buffer with an element prepended.

    [use case]

    A copy of the list buffer with an element prepended.

    Note that :-ending operators are right associative (see example). A mnemonic for `+:` vs. `:+` is: the COLon goes on the COLlection side.

    Also, the original list buffer is not modified, so you will want to capture the result.

    Example:

        scala> val x = List(1)
        x: List[Int] = List(1)

        scala> val y = 2 +: x
        y: List[Int] = List(2, 1)

        scala> println(x)
        List(1)

    elem

      the prepended element

    returns

      a new list buffer consisting of `elem` followed by all elements of this list buffer.

    Definition Classes
      SeqLike → GenSeqLike
    Full Signature

    #### def +:[B >: A, That](elem: B)(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

11. #### def +=(x: A): ListBuffer.this.type

    Appends a single element to this buffer.

    Appends a single element to this buffer. This operation takes constant time.

    x

      the element to append.

    returns

      this list buffer.

    Definition Classes
      ListBuffer → Builder → BufferLike → Growable

12. #### def +=(elem1: A, elem2: A, elems: A*): ListBuffer.this.type

    adds two or more elements to this growable collection.

    adds two or more elements to this growable collection.

    elem1

      the first element to add.

    elem2

      the second element to add.

    elems

      the remaining elements to add.

    returns

      the growable collection itself

    Definition Classes
      Growable

13. #### def +=:(x: A): ListBuffer.this.type

    Prepends a single element to this buffer.

    Prepends a single element to this buffer. This operation takes constant time.

    x

      the element to prepend.

    returns

      this list buffer.

    Definition Classes
      ListBuffer → BufferLike

14. #### def -(elem1: A, elem2: A, elems: A*): ListBuffer[A]

    Creates a new collection with all the elements of this collection except the two or more specified elements.

    Creates a new collection with all the elements of this collection except the two or more specified elements.

    elem1

      the first element to remove.

    elem2

      the second element to remove.

    elems

      the remaining elements to remove.

    returns

      a new collection consisting of all the elements of this collection except `elem1`, `elem2` and those in `elems`.

    Definition Classes
      BufferLike → Subtractable
    Annotations
      @migration
    Migration

      (Changed in version 2.8.0) `-` creates a new buffer. Use `-=` to remove an element from this buffer and return that buffer itself.

15. #### def -(elem: A): ListBuffer[A]

    Creates a new collection with all the elements of this collection except `elem`.

    Creates a new collection with all the elements of this collection except `elem`.

    elem

      the element to remove.

    returns

      a new collection consisting of all the elements of this collection except `elem`.

    Definition Classes
      BufferLike → Subtractable
    Annotations
      @migration
    Migration

      (Changed in version 2.8.0) `-` creates a new buffer. Use `-=` to remove an element from this buffer and return that buffer itself.

16. #### def --(xs: GenTraversableOnce[A]): ListBuffer[A]

    Creates a new collection with all the elements of this collection except those provided by the specified traversable object.

    Creates a new collection with all the elements of this collection except those provided by the specified traversable object.

    xs

      the traversable object.

    returns

      a new collection with all the elements of this collection except those in `xs`

    Definition Classes
      BufferLike → Subtractable
    Annotations
      @migration
    Migration

      (Changed in version 2.8.0) `--` creates a new buffer. Use `--=` to remove an element from this buffer and return that buffer itself.

17. #### def --=(xs: TraversableOnce[A]): ListBuffer.this.type

    Removes all elements produced by an iterator from this shrinkable collection.

    Removes all elements produced by an iterator from this shrinkable collection.

    xs

      the iterator producing the elements to remove.

    returns

      the shrinkable collection itself

    Definition Classes
      Shrinkable

18. #### def -=(elem: A): ListBuffer.this.type

    Remove a single element from this buffer.

    Remove a single element from this buffer. May take time linear in the buffer size.

    elem

      the element to remove.

    returns

      this list buffer.

    Definition Classes
      ListBuffer → BufferLike → Shrinkable

19. #### def -=(elem1: A, elem2: A, elems: A*): ListBuffer.this.type

    Removes two or more elements from this shrinkable collection.

    Removes two or more elements from this shrinkable collection.

    elem1

      the first element to remove.

    elem2

      the second element to remove.

    elems

      the remaining elements to remove.

    returns

      the shrinkable collection itself

    Definition Classes
      Shrinkable

20. #### def ->[B](y: B): (ListBuffer[A], B)

    Implicit information
      This member is added by an implicit conversion from ListBuffer[A] to ArrowAssoc[ListBuffer[A]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc
    Annotations
      @inline()

21. #### def /:[B](z: B)(op: (B, A) ⇒ B): B

    Applies a binary operator to a start value and all elements of this collection, going left to right.

    Applies a binary operator to a start value and all elements of this collection, going left to right.

    Note: `/:` is alternate syntax for `foldLeft`; `z /: xs` is the same as `xs foldLeft z`.

    Examples:

    Note that the folding function used to compute b is equivalent to that used to compute c.

        scala> val a = List(1,2,3,4)
        a: List[Int] = List(1, 2, 3, 4)

        scala> val b = (5 /: a)(_+_)
        b: Int = 15

        scala> val c = (5 /: a)((x,y) => x + y)
        c: Int = 15

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    B

      the result type of the binary operator.

    z

      the start value.

    op

      the binary operator.

    returns

      the result of inserting `op` between consecutive elements of this collection, going left to right with the start value `z` on the left:

          op(...op(op(z, x_1), x_2), ..., x_n)

      where `x1, ..., xn` are the elements of this collection.

    Definition Classes
      TraversableForwarder → TraversableOnce → GenTraversableOnce

22. #### def :+(elem: A): ListBuffer[A]

    [use case] A copy of this list buffer with an element appended.

    [use case]

    A copy of this list buffer with an element appended.

    A mnemonic for `+:` vs. `:+` is: the COLon goes on the COLlection side.

    Example:

        scala> val a = List(1)
        a: List[Int] = List(1)

        scala> val b = a :+ 2
        b: List[Int] = List(1, 2)

        scala> println(a)
        List(1)

    elem

      the appended element

    returns

      a new list buffer consisting of all elements of this list buffer followed by `elem`.

    Definition Classes
      SeqLike → GenSeqLike
    Full Signature

    #### def :+[B >: A, That](elem: B)(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

23. #### def :\[B](z: B)(op: (A, B) ⇒ B): B

    Applies a binary operator to all elements of this collection and a start value, going right to left.

    Applies a binary operator to all elements of this collection and a start value, going right to left.

    Note: `:\` is alternate syntax for `foldRight`; `xs :\ z` is the same as `xs foldRight z`.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    Examples:

    Note that the folding function used to compute b is equivalent to that used to compute c.

        scala> val a = List(1,2,3,4)
        a: List[Int] = List(1, 2, 3, 4)

        scala> val b = (a :\ 5)(_+_)
        b: Int = 15

        scala> val c = (a :\ 5)((x,y) => x + y)
        c: Int = 15

    B

      the result type of the binary operator.

    z

      the start value

    op

      the binary operator

    returns

      the result of inserting `op` between consecutive elements of this collection, going right to left with the start value `z` on the right:

          op(x_1, op(x_2, ... op(x_n, z)...))

      where `x1, ..., xn` are the elements of this collection.

    Definition Classes
      TraversableForwarder → TraversableOnce → GenTraversableOnce

24. #### final def ==(arg0: Any): Boolean

    Definition Classes
      AnyRef → Any

25. #### def addString(b: StringBuilder): StringBuilder

    Appends all elements of this collection to a string builder.

    Appends all elements of this collection to a string builder. The written text consists of the string representations (w.r.t. the method `toString`) of all elements of this collection without any separator string.

    Example:

        scala> val a = List(1,2,3,4)
        a: List[Int] = List(1, 2, 3, 4)

        scala> val b = new StringBuilder()
        b: StringBuilder =

        scala> val h = a.addString(b)
        h: StringBuilder = 1234

    b

      the string builder to which elements are appended.

    returns

      the string builder `b` to which elements were appended.

    Definition Classes
      TraversableForwarder → TraversableOnce

26. #### def addString(b: StringBuilder, sep: String): StringBuilder

    Appends all elements of this collection to a string builder using a separator string.

    Appends all elements of this collection to a string builder using a separator string. The written text consists of the string representations (w.r.t. the method `toString`) of all elements of this collection, separated by the string `sep`.

    Example:

        scala> val a = List(1,2,3,4)
        a: List[Int] = List(1, 2, 3, 4)

        scala> val b = new StringBuilder()
        b: StringBuilder =

        scala> a.addString(b, ", ")
        res0: StringBuilder = 1, 2, 3, 4

    b

      the string builder to which elements are appended.

    sep

      the separator string.

    returns

      the string builder `b` to which elements were appended.

    Definition Classes
      TraversableForwarder → TraversableOnce

27. #### def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder

    Appends all elements of this collection to a string builder using start, end, and separator strings.

    Appends all elements of this collection to a string builder using start, end, and separator strings. The written text begins with the string `start` and ends with the string `end`. Inside, the string representations (w.r.t. the method `toString`) of all elements of this collection are separated by the string `sep`.

    Example:

        scala> val a = List(1,2,3,4)
        a: List[Int] = List(1, 2, 3, 4)

        scala> val b = new StringBuilder()
        b: StringBuilder =

        scala> a.addString(b , "List(" , ", " , ")")
        res5: StringBuilder = List(1, 2, 3, 4)

    b

      the string builder to which elements are appended.

    start

      the starting string.

    sep

      the separator string.

    end

      the ending string.

    returns

      the string builder `b` to which elements were appended.

    Definition Classes
      TraversableForwarder → TraversableOnce

28. #### def aggregate[B](z: ⇒ B)(seqop: (B, A) ⇒ B, combop: (B, B) ⇒ B): B

    Aggregates the results of applying an operator to subsequent elements.

    Aggregates the results of applying an operator to subsequent elements.

    This is a more general form of `fold` and `reduce`. It has similar semantics, but does not require the result to be a supertype of the element type. It traverses the elements in different partitions sequentially, using `seqop` to update the result, and then applies `combop` to results from different partitions. The implementation of this operation may operate on an arbitrary number of collection partitions, so `combop` may be invoked an arbitrary number of times.

    For example, one might want to process some elements and then produce a `Set`. In this case, `seqop` would process an element and append it to the list, while `combop` would concatenate two lists from different partitions together. The initial value `z` would be an empty set.

        pc.aggregate(Set[Int]())(_ += process(_), _ ++ _)

    Another example is calculating geometric mean from a collection of doubles (one would typically require big doubles for this).

    B

      the type of accumulated results

    z

      the initial value for the accumulated result of the partition - this will typically be the neutral element for the `seqop` operator (e.g. `Nil` for list concatenation or `0` for summation) and may be evaluated more than once

    seqop

      an operator used to accumulate results within a partition

    combop

      an associative operator used to combine results from different partitions

    Definition Classes
      TraversableOnce → GenTraversableOnce

29. #### def andThen[C](k: (A) ⇒ C): PartialFunction[Int, C]

    Composes this partial function with a transformation function that gets applied to results of this partial function.

    Composes this partial function with a transformation function that gets applied to results of this partial function.

    C

      the result type of the transformation function.

    k

      the transformation function

    returns

      a partial function with the same domain as this partial function, which maps arguments `x` to `k(this(x))`.

    Definition Classes
      PartialFunction → Function1

30. #### def append(elems: A*): Unit

    Appends the given elements to this buffer.

    Appends the given elements to this buffer.

    elems

      the elements to append.

    Definition Classes
      BufferLike

31. #### def appendAll(xs: TraversableOnce[A]): Unit

    Appends the elements contained in a traversable object to this buffer.

    Appends the elements contained in a traversable object to this buffer.

    xs

      the traversable object containing the elements to append.

    Definition Classes
      BufferLike

32. #### def apply(n: Int): A

    Selects an element by its index in the list buffer.

    Selects an element by its index in the list buffer.

    Example:

        scala> val x = List(1, 2, 3, 4, 5)
        x: List[Int] = List(1, 2, 3, 4, 5)

        scala> x(3)
        res1: Int = 4

    returns

      the element of this list buffer at index `idx`, where `0` indicates the first element.

    Definition Classes
      ListBuffer → SeqForwarder → BufferLike → SeqLike → GenSeqLike → Function1
    Exceptions thrown
      `IndexOutOfBoundsException`

      if `idx` does not satisfy `0 <= idx < length`.

33. #### def applyOrElse[A1 <: Int, B1 >: A](x: A1, default: (A1) ⇒ B1): B1

    Applies this partial function to the given argument when it is contained in the function domain.

    Applies this partial function to the given argument when it is contained in the function domain. Applies fallback function where this partial function is not defined.

    Note that expression `pf.applyOrElse(x, default)` is equivalent to

        if(pf isDefinedAt x) pf(x) else default(x)

    except that `applyOrElse` method can be implemented more efficiently. For all partial function literals the compiler generates an `applyOrElse` implementation which avoids double evaluation of pattern matchers and guards. This makes `applyOrElse` the basis for the efficient implementation for many operations and scenarios, such as:

    - combining partial functions into `orElse`/`andThen` chains does not lead to excessive `apply`/`isDefinedAt` evaluation
    - `lift` and `unlift` do not evaluate source functions twice on each invocation
    - `runWith` allows efficient imperative-style combining of partial functions with conditionally applied actions

    For non-literal partial function classes with nontrivial `isDefinedAt` method it is recommended to override `applyOrElse` with custom implementation that avoids double `isDefinedAt` evaluation. This may result in better performance and more predictable behavior w.r.t. side effects.

    x

      the function argument

    default

      the fallback function

    returns

      the result of this function or fallback function application.

    Definition Classes
      PartialFunction
    Since

      2.10

34. #### final def asInstanceOf[T0]: T0

    Definition Classes
      Any

35. #### def canEqual(that: Any): Boolean

    Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.

    Method called from equality methods, so that user-defined subclasses can refuse to be equal to other collections of the same kind.

    that

      The object with which this iterable collection should be compared

    returns

      `true`, if this iterable collection can possibly equal `that`, `false` otherwise. The test takes into consideration only the run-time types of objects but ignores their elements.

    Definition Classes
      IterableLike → Equals

36. #### def clear(): Unit

    Clears the buffer contents.

    Clears the buffer contents.

    Definition Classes
      ListBuffer → Builder → BufferLike → Growable → Clearable

37. #### def clone(): ListBuffer[A]

    Returns a clone of this buffer.

    Returns a clone of this buffer.

    returns

      a `ListBuffer` with the same elements.

    Definition Classes
      ListBuffer → BufferLike → Cloneable → AnyRef

38. #### def collect[B](pf: PartialFunction[A, B]): ListBuffer[B]

    [use case] Builds a new collection by applying a partial function to all elements of this list buffer on which the function is defined.

    [use case]

    Builds a new collection by applying a partial function to all elements of this list buffer on which the function is defined.

    B

      the element type of the returned collection.

    pf

      the partial function which filters and maps the list buffer.

    returns

      a new list buffer resulting from applying the given partial function `pf` to each element on which it is defined and collecting the results. The order of the elements is preserved.

    Definition Classes
      TraversableLike → GenTraversableLike
    Full Signature

    #### def collect[B, That](pf: PartialFunction[A, B])(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

39. #### def collectFirst[B](pf: PartialFunction[A, B]): Option[B]

    Finds the first element of the traversable or iterator for which the given partial function is defined, and applies the partial function to it.

    Finds the first element of the traversable or iterator for which the given partial function is defined, and applies the partial function to it.

    Note: may not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    pf

      the partial function

    returns

      an option value containing pf applied to the first value for which it is defined, or `None` if none exists.

    Definition Classes
      TraversableOnce
    Example:

    1. `Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)`

40. #### def combinations(n: Int): Iterator[ListBuffer[A]]

    Iterates over combinations.

    Iterates over combinations.

    returns

      An Iterator which traverses the possible n-element combinations of this sequence.

    Definition Classes
      SeqLike
    Example:

    1. `"abbbc".combinations(2) = Iterator(ab, ac, bb, bc)`

41. #### def companion: GenericCompanion[ListBuffer]

    The factory companion object that builds instances of class `ListBuffer`.

    The factory companion object that builds instances of class `ListBuffer`. (or its `Iterable` superclass where class `ListBuffer` is not a `Seq`.)

    Definition Classes
      ListBuffer → Buffer → Seq → Iterable → Traversable → Seq → GenSeq → Iterable → GenIterable → Traversable → GenTraversable → GenericTraversableTemplate

42. #### def compose[A](g: (A) ⇒ Int): (A) ⇒ A

    Composes two instances of Function1 in a new Function1, with this function applied last.

    Composes two instances of Function1 in a new Function1, with this function applied last.

    A

      the type to which function `g` can be applied

    g

      a function A => T1

    returns

      a new function `f` such that `f(x) == apply(g(x))`

    Definition Classes
      Function1
    Annotations
      @unspecialized()

43. #### def contains[A1 >: A](elem: A1): Boolean

    Tests whether this sequence contains a given value as an element.

    Tests whether this sequence contains a given value as an element.

    Note: may not terminate for infinite-sized collections.

    elem

      the element to test.

    returns

      `true` if this sequence has an element that is equal (as determined by `==`) to `elem`, `false` otherwise.

    Definition Classes
      SeqForwarder → SeqLike

44. #### def containsSlice[B](that: GenSeq[B]): Boolean

    Tests whether this sequence contains a given sequence as a slice.

    Tests whether this sequence contains a given sequence as a slice.

    Note: may not terminate for infinite-sized collections.

    that

      the sequence to test

    returns

      `true` if this sequence contains a slice with the same elements as `that`, otherwise `false`.

    Definition Classes
      SeqForwarder → SeqLike

45. #### def copyToArray(xs: Array[A]): Unit

    [use case] Copies values of this list buffer to an array.

    [use case]

    Copies values of this list buffer to an array. Fills the given array `xs` with values of this list buffer. Copying will stop once either the end of the current list buffer is reached, or the end of the array is reached.

    xs

      the array to fill.

    Definition Classes
      TraversableForwarder → TraversableOnce → GenTraversableOnce
    Full Signature

    #### def copyToArray[B >: A](xs: Array[B]): Unit

46. #### def copyToArray(xs: Array[A], start: Int): Unit

    [use case] Copies values of this list buffer to an array.

    [use case]

    Copies values of this list buffer to an array. Fills the given array `xs` with values of this list buffer, beginning at index `start`. Copying will stop once either the end of the current list buffer is reached, or the end of the array is reached.

    xs

      the array to fill.

    start

      the starting index.

    Definition Classes
      TraversableForwarder → TraversableOnce → GenTraversableOnce
    Full Signature

    #### def copyToArray[B >: A](xs: Array[B], start: Int): Unit

47. #### def copyToArray(xs: Array[A], start: Int, len: Int): Unit

    [use case] Copies elements of this list buffer to an array.

    [use case]

    Copies elements of this list buffer to an array. Fills the given array `xs` with at most `len` elements of this list buffer, starting at position `start`. Copying will stop once either the end of the current list buffer is reached, or the end of the array is reached, or `len` elements have been copied.

    xs

      the array to fill.

    start

      the starting index.

    len

      the maximal number of elements to copy.

    Definition Classes
      TraversableForwarder → TraversableLike → TraversableOnce → GenTraversableOnce
    Full Signature

    #### def copyToArray[B >: A](xs: Array[B], start: Int, len: Int): Unit

48. #### def copyToBuffer[B >: A](dest: Buffer[B]): Unit

    Copies all elements of this collection to a buffer.

    Copies all elements of this collection to a buffer.

    Note: will not terminate for infinite-sized collections.

    dest

      The buffer to which elements are copied.

    Definition Classes
      TraversableForwarder → TraversableOnce

49. #### def corresponds[B](that: GenSeq[B])(p: (A, B) ⇒ Boolean): Boolean

    Tests whether every element of this sequence relates to the corresponding element of another sequence by satisfying a test predicate.

    Tests whether every element of this sequence relates to the corresponding element of another sequence by satisfying a test predicate.

    B

      the type of the elements of `that`

    that

      the other sequence

    p

      the test predicate, which relates elements from both sequences

    returns

      `true` if both sequences have the same length and `p(x, y)` is `true` for all corresponding elements `x` of this sequence and `y` of `that`, otherwise `false`.

    Definition Classes
      SeqForwarder → SeqLike → GenSeqLike

50. #### def count(p: (A) ⇒ Boolean): Int

    Counts the number of elements in the collection which satisfy a predicate.

    Counts the number of elements in the collection which satisfy a predicate.

    p

      the predicate used to test elements.

    returns

      the number of elements satisfying the predicate `p`.

    Definition Classes
      TraversableForwarder → TraversableOnce → GenTraversableOnce

51. #### def diff(that: collection.Seq[A]): ListBuffer[A]

    [use case] Computes the multiset difference between this list buffer and another sequence.

    [use case]

    Computes the multiset difference between this list buffer and another sequence.

    that

      the sequence of elements to remove

    returns

      a new list buffer which contains all elements of this list buffer except some of occurrences of elements that also appear in `that`. If an element value `x` appears n times in `that`, then the first n occurrences of `x` will not form part of the result, but any following occurrences will.

    Definition Classes
      SeqLike → GenSeqLike
    Full Signature

    #### def diff[B >: A](that: GenSeq[B]): ListBuffer[A]

52. #### def distinct: ListBuffer[A]

    Builds a new sequence from this sequence without any duplicate elements.

    Builds a new sequence from this sequence without any duplicate elements.

    Note: will not terminate for infinite-sized collections.

    returns

      A new sequence which contains the first occurrence of every element of this sequence.

    Definition Classes
      SeqLike → GenSeqLike

53. #### def drop(n: Int): ListBuffer[A]

    Selects all elements except first n ones.

    Selects all elements except first n ones.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

      the number of elements to drop from this iterable collection.

    returns

      a iterable collection consisting of all elements of this iterable collection except the first `n` ones, or else the empty iterable collection, if this iterable collection has less than `n` elements.

    Definition Classes
      IterableLike → TraversableLike → GenTraversableLike

54. #### def dropRight(n: Int): ListBuffer[A]

    Selects all elements except last n ones.

    Selects all elements except last n ones.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    n

      The number of elements to take

    returns

      a iterable collection consisting of all elements of this iterable collection except the last `n` ones, or else the empty iterable collection, if this iterable collection has less than `n` elements.

    Definition Classes
      IterableLike

55. #### def dropWhile(p: (A) ⇒ Boolean): ListBuffer[A]

    Drops longest prefix of elements that satisfy a predicate.

    Drops longest prefix of elements that satisfy a predicate.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

      the longest suffix of this traversable collection whose first element does not satisfy the predicate `p`.

    Definition Classes
      TraversableLike → GenTraversableLike

56. #### def endsWith[B](that: GenSeq[B]): Boolean

    Tests whether this sequence ends with the given sequence.

    Tests whether this sequence ends with the given sequence.

    Note: will not terminate for infinite-sized collections.

    that

      the sequence to test

    returns

      `true` if this sequence has `that` as a suffix, `false` otherwise.

    Definition Classes
      SeqForwarder → SeqLike → GenSeqLike

57. #### def ensuring(cond: (ListBuffer[A]) ⇒ Boolean, msg: ⇒ Any): ListBuffer[A]

    Implicit information
      This member is added by an implicit conversion from ListBuffer[A] to Ensuring[ListBuffer[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

58. #### def ensuring(cond: (ListBuffer[A]) ⇒ Boolean): ListBuffer[A]

    Implicit information
      This member is added by an implicit conversion from ListBuffer[A] to Ensuring[ListBuffer[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

59. #### def ensuring(cond: Boolean, msg: ⇒ Any): ListBuffer[A]

    Implicit information
      This member is added by an implicit conversion from ListBuffer[A] to Ensuring[ListBuffer[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

60. #### def ensuring(cond: Boolean): ListBuffer[A]

    Implicit information
      This member is added by an implicit conversion from ListBuffer[A] to Ensuring[ListBuffer[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

61. #### final def eq(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

62. #### def equals(that: Any): Boolean

    The equals method for arbitrary sequences.

    The equals method for arbitrary sequences. Compares this sequence to some other object.

    that

      The object to compare the sequence to

    returns

      `true` if `that` is a sequence that has the same elements as this sequence in the same order, `false` otherwise

    Definition Classes
      ListBuffer → GenSeqLike → Equals → AnyRef → Any

63. #### def exists(p: (A) ⇒ Boolean): Boolean

    Tests whether a predicate holds for some of the elements of this collection.

    Tests whether a predicate holds for some of the elements of this collection.

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

      `true` if the given predicate `p` holds for some of the elements of this collection, otherwise `false`.

    Definition Classes
      TraversableForwarder → TraversableLike → TraversableOnce → GenTraversableOnce

64. #### def filter(p: (A) ⇒ Boolean): ListBuffer[A]

    Selects all elements of this traversable collection which satisfy a predicate.

    Selects all elements of this traversable collection which satisfy a predicate.

    p

      the predicate used to test elements.

    returns

      a new traversable collection consisting of all elements of this traversable collection that satisfy the given predicate `p`. The order of the elements is preserved.

    Definition Classes
      TraversableLike → GenTraversableLike

65. #### def filterNot(p: (A) ⇒ Boolean): ListBuffer[A]

    Selects all elements of this traversable collection which do not satisfy a predicate.

    Selects all elements of this traversable collection which do not satisfy a predicate.

    p

      the predicate used to test elements.

    returns

      a new traversable collection consisting of all elements of this traversable collection that do not satisfy the given predicate `p`. The order of the elements is preserved.

    Definition Classes
      TraversableLike → GenTraversableLike

66. #### def finalize(): Unit

    Attributes
      protected[java.lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( classOf[java.lang.Throwable] )

67. #### def find(p: (A) ⇒ Boolean): Option[A]

    Finds the first element of the collection satisfying a predicate, if any.

    Finds the first element of the collection satisfying a predicate, if any.

    Note: may not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    p

      the predicate used to test elements.

    returns

      an option value containing the first element in the collection that satisfies `p`, or `None` if none exists.

    Definition Classes
      TraversableForwarder → TraversableLike → TraversableOnce → GenTraversableOnce

68. #### def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): ListBuffer[B]

    [use case] Builds a new collection by applying a function to all elements of this list buffer and using the elements of the resulting collections.

    [use case]

    Builds a new collection by applying a function to all elements of this list buffer and using the elements of the resulting collections.

    For example:

        def getWords(lines: Seq[String]): Seq[String] = lines flatMap (line => line split "\\W+")

    The type of the resulting collection is guided by the static type of list buffer. This might cause unexpected results sometimes. For example:

        // lettersOf will return a Seq[Char] of likely repeated letters, instead of a Set
        def lettersOf(words: Seq[String]) = words flatMap (word => word.toSet)

        // lettersOf will return a Set[Char], not a Seq
        def lettersOf(words: Seq[String]) = words.toSet flatMap (word => word.toSeq)

        // xs will be an Iterable[Int]
        val xs = Map("a" -> List(11,111), "b" -> List(22,222)).flatMap(_._2)

        // ys will be a Map[Int, Int]
        val ys = Map("a" -> List(1 -> 11,1 -> 111), "b" -> List(2 -> 22,2 -> 222)).flatMap(_._2)

    B

      the element type of the returned collection.

    f

      the function to apply to each element.

    returns

      a new list buffer resulting from applying the given collection-valued function `f` to each element of this list buffer and concatenating the results.

    Definition Classes
      TraversableLike → GenTraversableLike → FilterMonadic
    Full Signature

    #### def flatMap[B, That](f: (A) ⇒ GenTraversableOnce[B])(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

69. #### def flatten[B]: ListBuffer[B]

    [use case] Converts this list buffer of traversable collections into a list buffer formed by the elements of these traversable collections.

    [use case]

    Converts this list buffer of traversable collections into a list buffer formed by the elements of these traversable collections.

    The resulting collection's type will be guided by the static type of list buffer. For example:

        val xs = List(
                   Set(1, 2, 3),
                   Set(1, 2, 3)
                 ).flatten
        // xs == List(1, 2, 3, 1, 2, 3)

        val ys = Set(
                   List(1, 2, 3),
                   List(3, 2, 1)
                 ).flatten
        // ys == Set(1, 2, 3)

    B

      the type of the elements of each traversable collection.

    returns

      a new list buffer resulting from concatenating all element list buffers.

    Definition Classes
      GenericTraversableTemplate
    Full Signature

    #### def flatten[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): ListBuffer[B]

70. #### def fold[A1 >: A](z: A1)(op: (A1, A1) ⇒ A1): A1

    Folds the elements of this traversable or iterator using the specified associative binary operator.

    Folds the elements of this traversable or iterator using the specified associative binary operator.

    The order in which operations are performed on elements is unspecified and may be nondeterministic.

    A1

      a type parameter for the binary operator, a supertype of `A`.

    z

      a neutral element for the fold operation; may be added to the result an arbitrary number of times, and must not change the result (e.g., `Nil` for list concatenation, 0 for addition, or 1 for multiplication.)

    op

      a binary operator that must be associative

    returns

      the result of applying fold operator `op` between all the elements and `z`

    Definition Classes
      TraversableOnce → GenTraversableOnce

71. #### def foldLeft[B](z: B)(op: (B, A) ⇒ B): B

    Applies a binary operator to a start value and all elements of this collection, going left to right.

    Applies a binary operator to a start value and all elements of this collection, going left to right.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    B

      the result type of the binary operator.

    z

      the start value.

    op

      the binary operator.

    returns

      the result of inserting `op` between consecutive elements of this collection, going left to right with the start value `z` on the left:

          op(...op(z, x_1), x_2, ..., x_n)

      where `x1, ..., xn` are the elements of this collection.

    Definition Classes
      TraversableForwarder → TraversableOnce → GenTraversableOnce

72. #### def foldRight[B](z: B)(op: (A, B) ⇒ B): B

    Applies a binary operator to all elements of this collection and a start value, going right to left.

    Applies a binary operator to all elements of this collection and a start value, going right to left.

    Note: will not terminate for infinite-sized collections.

    Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

    B

      the result type of the binary operator.

    z

      the start value.

    op

      the binary operator.

    returns

      the result of inserting `op` between consecutive elements of this collection, going right to left with the start value `z` on the right:

          op(x_1, op(x_2, ... op(x_n, z)...))

      where `x1, ..., xn` are the elements of this collection.

    Definition Classes
      TraversableForwarder → TraversableOnce → GenTraversableOnce

73. #### def forall(p: (A) ⇒ Boolean): Boolean

    Tests whether a predicate holds for all elements of this collection.

    Tests whether a predicate holds for all elements of this collection.

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

      `true` if the given predicate `p` holds for all elements of this collection, otherwise `false`.

    Definition Classes
      TraversableForwarder → TraversableLike → TraversableOnce → GenTraversableOnce

74. #### def foreach(f: (A) ⇒ Unit): Unit

    [use case]

    [use case]
    f

      the function that is applied for its side-effect to every element. The result of function `f` is discarded.

    Definition Classes
      TraversableForwarder → GenericTraversableTemplate → TraversableLike → GenTraversableLike → TraversableOnce → GenTraversableOnce → FilterMonadic
    Full Signature

    #### def foreach[B](f: (A) ⇒ B): Unit

75. #### def formatted(fmtstr: String): String

    Returns string formatted according to given `format` string.

    Returns string formatted according to given `format` string. Format strings are as for `String.format` (@see java.lang.String.format).

    Implicit information
      This member is added by an implicit conversion from ListBuffer[A] to StringFormat[ListBuffer[A]] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()

76. #### def genericBuilder[B]: Builder[B, ListBuffer[B]]

    The generic builder that builds instances of CC at arbitrary element types.

    The generic builder that builds instances of CC at arbitrary element types.

    Definition Classes
      GenericTraversableTemplate

77. #### final def getClass(): Class[_]

    Definition Classes
      AnyRef → Any

78. #### def groupBy[K](f: (A) ⇒ K): immutable.Map[K, ListBuffer[A]]

    Partitions this traversable collection into a map of traversable collections according to some discriminator function.

    Partitions this traversable collection into a map of traversable collections according to some discriminator function.

    Note: this method is not re-implemented by views. This means when applied to a view it will always force the view and return a new traversable collection.

    K

      the type of keys returned by the discriminator function.

    f

      the discriminator function.

    returns

      A map from keys to traversable collections such that the following invariant holds:

          (xs groupBy f)(k) = xs filter (x => f(x) == k)

      That is, every key `k` is bound to a traversable collection of those elements `x` for which `f(x)` equals `k`.

    Definition Classes
      TraversableLike → GenTraversableLike

79. #### def grouped(size: Int): Iterator[ListBuffer[A]]

    Partitions elements in fixed size iterable collections.

    Partitions elements in fixed size iterable collections.

    size

      the number of elements per group

    returns

      An iterator producing iterable collections of size `size`, except the last will be less than size `size` if the elements don't divide evenly.

    Definition Classes
      IterableLike
    See also

      scala.collection.Iterator, method `grouped`

80. #### def hasDefiniteSize: Boolean

    Tests whether this collection is known to have a finite size.

    Tests whether this collection is known to have a finite size. All strict collections are known to have finite size. For a non-strict collection such as `Stream`, the predicate returns `true` if all elements have been computed. It returns `false` if the stream is not yet evaluated to the end.

    Note: many collection methods will not work on collections of infinite sizes.

    returns

      `true` if this collection is known to have finite size, `false` otherwise.

    Definition Classes
      TraversableForwarder → TraversableLike → TraversableOnce → GenTraversableOnce

81. #### def hashCode(): Int

    Hashcodes for GenSeq produce a value from the hashcodes of all the elements of the general sequence.

    Hashcodes for GenSeq produce a value from the hashcodes of all the elements of the general sequence.

    Definition Classes
      GenSeqLike → Any

82. #### def head: A

    Selects the first element of this collection.

    Selects the first element of this collection.

    returns

      the first element of this collection.

    Definition Classes
      TraversableForwarder → GenericTraversableTemplate → TraversableLike → GenTraversableLike
    Exceptions thrown
      `NoSuchElementException`

      if the collection is empty.

83. #### def headOption: Option[A]

    Optionally selects the first element.

    Optionally selects the first element.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

      the first element of this collection if it is nonempty, `None` if it is empty.

    Definition Classes
      TraversableForwarder → TraversableLike → GenTraversableLike

84. #### def indexOf(elem: A, from: Int): Int

    [use case] Finds index of first occurrence of some value in this list buffer after or at some start index.

    [use case]

    Finds index of first occurrence of some value in this list buffer after or at some start index.

    elem

      the element value to search for.

    from

      the start index

    returns

      the index `>= from` of the first element of this list buffer that is equal (as determined by `==`) to `elem`, or `-1`, if none exists.

    Definition Classes
      SeqForwarder → GenSeqLike
    Full Signature

    #### def indexOf[B >: A](elem: B, from: Int): Int

85. #### def indexOf(elem: A): Int

    [use case] Finds index of first occurrence of some value in this list buffer.

    [use case]

    Finds index of first occurrence of some value in this list buffer.

    elem

      the element value to search for.

    returns

      the index of the first element of this list buffer that is equal (as determined by `==`) to `elem`, or `-1`, if none exists.

    Definition Classes
      SeqForwarder → GenSeqLike
    Full Signature

    #### def indexOf[B >: A](elem: B): Int

86. #### def indexOfSlice[B >: A](that: GenSeq[B], from: Int): Int

    Finds first index after or at a start index where this sequence contains a given sequence as a slice.

    Finds first index after or at a start index where this sequence contains a given sequence as a slice.

    Note: may not terminate for infinite-sized collections.

    that

      the sequence to test

    from

      the start index

    returns

      the first index `>= from` such that the elements of this sequence starting at this index match the elements of sequence `that`, or `-1` of no such subsequence exists.

    Definition Classes
      SeqForwarder → SeqLike

87. #### def indexOfSlice[B >: A](that: GenSeq[B]): Int

    Finds first index where this sequence contains a given sequence as a slice.

    Finds first index where this sequence contains a given sequence as a slice.

    Note: may not terminate for infinite-sized collections.

    that

      the sequence to test

    returns

      the first index such that the elements of this sequence starting at this index match the elements of sequence `that`, or `-1` of no such subsequence exists.

    Definition Classes
      SeqForwarder → SeqLike

88. #### def indexWhere(p: (A) ⇒ Boolean, from: Int): Int

    Finds index of the first element satisfying some predicate after or at some start index.

    Finds index of the first element satisfying some predicate after or at some start index.

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    from

      the start index

    returns

      the index `>= from` of the first element of this sequence that satisfies the predicate `p`, or `-1`, if none exists.

    Definition Classes
      SeqForwarder → SeqLike → GenSeqLike

89. #### def indexWhere(p: (A) ⇒ Boolean): Int

    Finds index of first element satisfying some predicate.

    Finds index of first element satisfying some predicate.

    Note: may not terminate for infinite-sized collections.

    p

      the predicate used to test elements.

    returns

      the index of the first element of this sequence that satisfies the predicate `p`, or `-1`, if none exists.

    Definition Classes
      SeqForwarder → GenSeqLike

90. #### def indices: immutable.Range

    Produces the range of all indices of this sequence.

    Produces the range of all indices of this sequence.

    returns

      a `Range` value from `0` to one less than the length of this sequence.

    Definition Classes
      SeqForwarder → SeqLike

91. #### def init: ListBuffer[A]

    Selects all elements except the last.

    Selects all elements except the last.

    Note: might return different results for different runs, unless the underlying collection type is ordered.

    returns

      a traversable collection consisting of all elements of this traversable collection except the last one.

    Definition Classes
      TraversableLike → GenTraversableLike
    Exceptions thrown
      `UnsupportedOperationException`

      if the traversable collection is empty.

92. #### def inits: Iterator[ListBuffer[A]]

    Iterates over the inits of this traversable collection.

    Iterates over the inits of this traversable collection. The first value will be this traversable collection and the final one will be an empty traversable collection, with the intervening values the results of successive applications of `init`.

    returns

      an iterator over all the inits of this traversable collection

    Definition Classes
      TraversableLike
    Example:

    1. `List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)`

93. #### def insert(n: Int, elems: A*): Unit

    Inserts new elements at a given index into this buffer.

    Inserts new elements at a given index into this buffer.

    n

      the index where new elements are inserted.

    elems

      the traversable collection containing the elements to insert.

    Definition Classes
      BufferLike
    Exceptions thrown
      IndexOutOfBoundsException

      if the index `n` is not in the valid range `0 <= n <= length`.

94. #### def insertAll(n: Int, seq: collection.Traversable[A]): Unit

    Inserts new elements at the index `n`.

    Inserts new elements at the index `n`. Opposed to method `update`, this method will not replace an element with a new one. Instead, it will insert a new element at index `n`.

    n

      the index where a new element will be inserted.

    seq

      the iterable object providing all elements to insert.

    Definition Classes
      ListBuffer → BufferLike
    Exceptions thrown
      Predef.IndexOutOfBoundsException

      if `n` is out of bounds.

95. #### def intersect(that: collection.Seq[A]): ListBuffer[A]

    [use case] Computes the multiset intersection between this list buffer and another sequence.

    [use case]

    Computes the multiset intersection between this list buffer and another sequence.

    that

      the sequence of elements to intersect with.

    returns

      a new list buffer which contains all elements of this list buffer which also appear in `that`. If an element value `x` appears n times in `that`, then the first n occurrences of `x` will be retained in the result, but any following occurrences will be omitted.

    Definition Classes
      SeqLike → GenSeqLike
    Full Signature

    #### def intersect[B >: A](that: GenSeq[B]): ListBuffer[A]

96. #### def isDefinedAt(x: Int): Boolean

    Tests whether this sequence contains given index.

    Tests whether this sequence contains given index.

    The implementations of methods `apply` and `isDefinedAt` turn a `Seq[A]` into a `PartialFunction[Int, A]`.

    returns

      `true` if this sequence contains an element at position `idx`, `false` otherwise.

    Definition Classes
      SeqForwarder → GenSeqLike → PartialFunction

97. #### def isEmpty: Boolean

    Tests whether this collection is empty.

    Tests whether this collection is empty.

    returns

      `true` if the collection contain no elements, `false` otherwise.

    Definition Classes
      TraversableForwarder → GenericTraversableTemplate → TraversableLike → TraversableOnce → GenTraversableOnce

98. #### final def isInstanceOf[T0]: Boolean

    Definition Classes
      Any

99. #### final def isTraversableAgain: Boolean

    Tests whether this traversable collection can be repeatedly traversed.

    Tests whether this traversable collection can be repeatedly traversed.

    returns

      `true`

    Definition Classes
      TraversableLike → GenTraversableLike → GenTraversableOnce

100. #### def iterator: Iterator[A]

     Returns an iterator over this `ListBuffer`.

     Returns an iterator over this `ListBuffer`. The iterator will reflect changes made to the underlying `ListBuffer` beyond the next element; the next element's value is cached so that `hasNext` and `next` are guaranteed to be consistent. In particular, an empty `ListBuffer` will give an empty iterator even if the `ListBuffer` is later filled.

     returns

       the new iterator

     Definition Classes
       ListBuffer → IterableForwarder → IterableLike → GenIterableLike

101. #### def last: A

     Selects the last element.

     Selects the last element.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     returns

       The last element of this collection.

     Definition Classes
       TraversableForwarder → TraversableLike → GenTraversableLike
     Exceptions thrown
       NoSuchElementException

       If the collection is empty.

102. #### def lastIndexOf(elem: A, end: Int): Int

     [use case] Finds index of last occurrence of some value in this list buffer before or at a given end index.

     [use case]

     Finds index of last occurrence of some value in this list buffer before or at a given end index.

     elem

       the element value to search for.

     end

       the end index.

     returns

       the index `<= end` of the last element of this list buffer that is equal (as determined by `==`) to `elem`, or `-1`, if none exists.

     Definition Classes
       SeqForwarder → GenSeqLike
     Full Signature

     #### def lastIndexOf[B >: A](elem: B, end: Int): Int

103. #### def lastIndexOf(elem: A): Int

     [use case] Finds index of last occurrence of some value in this list buffer.

     [use case]

     Finds index of last occurrence of some value in this list buffer.

     elem

       the element value to search for.

     returns

       the index of the last element of this list buffer that is equal (as determined by `==`) to `elem`, or `-1`, if none exists.

     Definition Classes
       SeqForwarder → GenSeqLike
     Full Signature

     #### def lastIndexOf[B >: A](elem: B): Int

104. #### def lastIndexOfSlice[B >: A](that: GenSeq[B], end: Int): Int

     Finds last index before or at a given end index where this sequence contains a given sequence as a slice.

     Finds last index before or at a given end index where this sequence contains a given sequence as a slice.

     that

       the sequence to test

     end

       the end index

     returns

       the last index `<= end` such that the elements of this sequence starting at this index match the elements of sequence `that`, or `-1` of no such subsequence exists.

     Definition Classes
       SeqForwarder → SeqLike

105. #### def lastIndexOfSlice[B >: A](that: GenSeq[B]): Int

     Finds last index where this sequence contains a given sequence as a slice.

     Finds last index where this sequence contains a given sequence as a slice.

     Note: will not terminate for infinite-sized collections.

     that

       the sequence to test

     returns

       the last index such that the elements of this sequence starting a this index match the elements of sequence `that`, or `-1` of no such subsequence exists.

     Definition Classes
       SeqForwarder → SeqLike

106. #### def lastIndexWhere(p: (A) ⇒ Boolean, end: Int): Int

     Finds index of last element satisfying some predicate before or at given end index.

     Finds index of last element satisfying some predicate before or at given end index.

     p

       the predicate used to test elements.

     returns

       the index `<= end` of the last element of this sequence that satisfies the predicate `p`, or `-1`, if none exists.

     Definition Classes
       SeqForwarder → SeqLike → GenSeqLike

107. #### def lastIndexWhere(p: (A) ⇒ Boolean): Int

     Finds index of last element satisfying some predicate.

     Finds index of last element satisfying some predicate.

     Note: will not terminate for infinite-sized collections.

     p

       the predicate used to test elements.

     returns

       the index of the last element of this sequence that satisfies the predicate `p`, or `-1`, if none exists.

     Definition Classes
       SeqForwarder → GenSeqLike

108. #### def lastOption: Option[A]

     Optionally selects the last element.

     Optionally selects the last element.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     returns

       the last element of this collection$ if it is nonempty, `None` if it is empty.

     Definition Classes
       TraversableForwarder → TraversableLike → GenTraversableLike

109. #### def length: Int

     The current length of the buffer.

     The current length of the buffer.

     This operation takes constant time.

     returns

       the number of elements in this list buffer.

     Definition Classes
       ListBuffer → SeqForwarder → BufferLike → SeqLike → GenSeqLike

110. #### def lengthCompare(len: Int): Int

     Compares the length of this sequence to a test value.

     Compares the length of this sequence to a test value.

     len

       the test value that gets compared with the length.

     returns

       A value `x` where

           x <  0       if this.length <  len
           x == 0       if this.length == len
           x >  0       if this.length >  len

       The method as implemented here does not call `length` directly; its running time is `O(length min len)` instead of `O(length)`. The method should be overwritten if computing `length` is cheap.

     Definition Classes
       SeqForwarder → SeqLike

111. #### def lift: (Int) ⇒ Option[A]

     Turns this partial function into a plain function returning an `Option` result.

     Turns this partial function into a plain function returning an `Option` result.

     returns

       a function that takes an argument `x` to `Some(this(x))` if `this` is defined for `x`, and to `None` otherwise.

     Definition Classes
       PartialFunction
     See also

       Function.unlift

112. #### def map[B](f: (A) ⇒ B): ListBuffer[B]

     [use case] Builds a new collection by applying a function to all elements of this list buffer.

     [use case]

     Builds a new collection by applying a function to all elements of this list buffer.

     B

       the element type of the returned collection.

     f

       the function to apply to each element.

     returns

       a new list buffer resulting from applying the given function `f` to each element of this list buffer and collecting the results.

     Definition Classes
       TraversableLike → GenTraversableLike → FilterMonadic
     Full Signature

     #### def map[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

113. #### def mapResult[NewTo](f: (immutable.List[A]) ⇒ NewTo): Builder[A, NewTo]

     Creates a new builder by applying a transformation function to the results of this builder.

     Creates a new builder by applying a transformation function to the results of this builder.

     NewTo

       the type of collection returned by `f`.

     f

       the transformation function.

     returns

       a new builder which is the same as the current builder except that a transformation function is applied to this builder's result.

     Definition Classes
       Builder

114. #### def max: A

     [use case] Finds the largest element.

     [use case]

     Finds the largest element.

     returns

       the largest element of this list buffer.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce
     Full Signature

     #### def max[B >: A](implicit cmp: Ordering[B]): A

115. #### def maxBy[B](f: (A) ⇒ B): A

     [use case] Finds the first element which yields the largest value measured by function f.

     [use case]

     Finds the first element which yields the largest value measured by function f.

     B

       The result type of the function f.

     f

       The measuring function.

     returns

       the first element of this list buffer with the largest value measured by function f.

     Definition Classes
       TraversableOnce → GenTraversableOnce
     Full Signature

     #### def maxBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

116. #### def min: A

     [use case] Finds the smallest element.

     [use case]

     Finds the smallest element.

     returns

       the smallest element of this list buffer

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce
     Full Signature

     #### def min[B >: A](implicit cmp: Ordering[B]): A

117. #### def minBy[B](f: (A) ⇒ B): A

     [use case] Finds the first element which yields the smallest value measured by function f.

     [use case]

     Finds the first element which yields the smallest value measured by function f.

     B

       The result type of the function f.

     f

       The measuring function.

     returns

       the first element of this list buffer with the smallest value measured by function f.

     Definition Classes
       TraversableOnce → GenTraversableOnce
     Full Signature

     #### def minBy[B](f: (A) ⇒ B)(implicit cmp: Ordering[B]): A

118. #### def mkString: String

     Displays all elements of this collection in a string.

     Displays all elements of this collection in a string.

     returns

       a string representation of this collection. In the resulting string the string representations (w.r.t. the method `toString`) of all elements of this collection follow each other without any separator string.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce

119. #### def mkString(sep: String): String

     Displays all elements of this collection in a string using a separator string.

     Displays all elements of this collection in a string using a separator string.

     sep

       the separator string.

     returns

       a string representation of this collection. In the resulting string the string representations (w.r.t. the method `toString`) of all elements of this collection are separated by the string `sep`.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce
     Example:

     1. `List(1, 2, 3).mkString("|") = "1|2|3"`

120. #### def mkString(start: String, sep: String, end: String): String

     Displays all elements of this collection in a string using start, end, and separator strings.

     Displays all elements of this collection in a string using start, end, and separator strings.

     start

       the starting string.

     sep

       the separator string.

     end

       the ending string.

     returns

       a string representation of this collection. The resulting string begins with the string `start` and ends with the string `end`. Inside, the string representations (w.r.t. the method `toString`) of all elements of this collection are separated by the string `sep`.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce
     Example:

     1. `List(1, 2, 3).mkString("(", "; ", ")") = "(1; 2; 3)"`

121. #### final def ne(arg0: AnyRef): Boolean

     Definition Classes
       AnyRef

122. #### def newBuilder: Builder[A, ListBuffer[A]]

     The builder that builds instances of type CC[A]

     The builder that builds instances of type CC[A]

     Attributes
       protected[this]
     Definition Classes
       GenericTraversableTemplate → HasNewBuilder

123. #### def nonEmpty: Boolean

     Tests whether the collection is not empty.

     Tests whether the collection is not empty.

     returns

       `true` if the collection contains at least one element, `false` otherwise.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce

124. #### final def notify(): Unit

     Definition Classes
       AnyRef

125. #### final def notifyAll(): Unit

     Definition Classes
       AnyRef

126. #### def orElse[A1 <: Int, B1 >: A](that: PartialFunction[A1, B1]): PartialFunction[A1, B1]

     Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.

     Composes this partial function with a fallback partial function which gets applied where this partial function is not defined.

     A1

       the argument type of the fallback function

     B1

       the result type of the fallback function

     that

       the fallback function

     returns

       a partial function which has as domain the union of the domains of this partial function and `that`. The resulting partial function takes `x` to `this(x)` where `this` is defined, and to `that(x)` where it is not.

     Definition Classes
       PartialFunction

127. #### def padTo(len: Int, elem: A): ListBuffer[A]

     [use case] A copy of this list buffer with an element value appended until a given target length is reached.

     [use case]

     A copy of this list buffer with an element value appended until a given target length is reached.

     len

       the target length

     elem

       the padding value

     returns

       a new list buffer consisting of all elements of this list buffer followed by the minimal number of occurrences of `elem` so that the resulting list buffer has a length of at least `len`.

     Definition Classes
       SeqLike → GenSeqLike
     Full Signature

     #### def padTo[B >: A, That](len: Int, elem: B)(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

128. #### def par: ParSeq[A]

     Returns a parallel implementation of this collection.

     Returns a parallel implementation of this collection.

     For most collection types, this method creates a new parallel collection by copying all the elements. For these collection, `par` takes linear time. Mutable collections in this category do not produce a mutable parallel collection that has the same underlying dataset, so changes in one collection will not be reflected in the other one.

     Specific collections (e.g. `ParArray` or `mutable.ParHashMap`) override this default behaviour by creating a parallel collection which shares the same underlying dataset. For these collections, `par` takes constant or sublinear time.

     All parallel collections return a reference to themselves.

     returns

       a parallel implementation of this collection

     Definition Classes
       Parallelizable

129. #### def parCombiner: Combiner[A, ParSeq[A]]

     The default `par` implementation uses the combiner provided by this method to create a new parallel collection.

     The default `par` implementation uses the combiner provided by this method to create a new parallel collection.

     returns

       a combiner for the parallel collection of type `ParRepr`

     Attributes
       protected[this]
     Definition Classes
       SeqLike → SeqLike → TraversableLike → Parallelizable

130. #### def partition(p: (A) ⇒ Boolean): (ListBuffer[A], ListBuffer[A])

     Partitions this traversable collection in two traversable collections according to a predicate.

     Partitions this traversable collection in two traversable collections according to a predicate.

     p

       the predicate on which to partition.

     returns

       a pair of traversable collections: the first traversable collection consists of all elements that satisfy the predicate `p` and the second traversable collection consists of all elements that don't. The relative order of the elements in the resulting traversable collections is the same as in the original traversable collection.

     Definition Classes
       TraversableLike → GenTraversableLike

131. #### def patch(from: Int, that: GenSeq[A], replaced: Int): ListBuffer[A]

     [use case] Produces a new list buffer where a slice of elements in this list buffer is replaced by another sequence.

     [use case]

     Produces a new list buffer where a slice of elements in this list buffer is replaced by another sequence.

     from

       the index of the first replaced element

     replaced

       the number of elements to drop in the original list buffer

     returns

       a new list buffer consisting of all elements of this list buffer except that `replaced` elements starting from `from` are replaced by `patch`.

     Definition Classes
       SeqLike → GenSeqLike
     Full Signature

     #### def patch[B >: A, That](from: Int, patch: GenSeq[B], replaced: Int)(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

132. #### def permutations: Iterator[ListBuffer[A]]

     Iterates over distinct permutations.

     Iterates over distinct permutations.

     returns

       An Iterator which traverses the distinct permutations of this sequence.

     Definition Classes
       SeqLike
     Example:

     1. `"abb".permutations = Iterator(abb, bab, bba)`

133. #### def prefixLength(p: (A) ⇒ Boolean): Int

     Returns the length of the longest prefix whose elements all satisfy some predicate.

     Returns the length of the longest prefix whose elements all satisfy some predicate.

     Note: may not terminate for infinite-sized collections.

     p

       the predicate used to test elements.

     returns

       the length of the longest prefix of this sequence such that every element of the segment satisfies the predicate `p`.

     Definition Classes
       SeqForwarder → GenSeqLike

134. #### def prepend(elems: A*): Unit

     Prepends given elements to this buffer.

     Prepends given elements to this buffer.

     elems

       the elements to prepend.

     Definition Classes
       BufferLike

135. #### def prependAll(xs: TraversableOnce[A]): Unit

     Prepends the elements contained in a traversable object to this buffer.

     Prepends the elements contained in a traversable object to this buffer.

     xs

       the collection containing the elements to prepend.

     Definition Classes
       BufferLike

136. #### def prependToList(xs: immutable.List[A]): immutable.List[A]

     Prepends the elements of this buffer to a given list

     Prepends the elements of this buffer to a given list

     xs

       the list to which elements are prepended

137. #### def product: A

     [use case] Multiplies up the elements of this collection.

     [use case]

     Multiplies up the elements of this collection.

     returns

       the product of all elements in this list buffer of numbers of type `Int`. Instead of `Int`, any other type `T` with an implicit `Numeric[T]` implementation can be used as element type of the list buffer and as result type of `product`. Examples of such types are: `Long`, `Float`, `Double`, `BigInt`.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce
     Full Signature

     #### def product[B >: A](implicit num: Numeric[B]): B

138. #### def reduce[A1 >: A](op: (A1, A1) ⇒ A1): A1

     Reduces the elements of this traversable or iterator using the specified associative binary operator.

     Reduces the elements of this traversable or iterator using the specified associative binary operator.

     The order in which operations are performed on elements is unspecified and may be nondeterministic.

     A1

       A type parameter for the binary operator, a supertype of `A`.

     op

       A binary operator that must be associative.

     returns

       The result of applying reduce operator `op` between all the elements if the traversable or iterator is nonempty.

     Definition Classes
       TraversableOnce → GenTraversableOnce
     Exceptions thrown
       UnsupportedOperationException

       if this traversable or iterator is empty.

139. #### def reduceLeft[B >: A](op: (B, A) ⇒ B): B

     Applies a binary operator to all elements of this collection, going left to right.

     Applies a binary operator to all elements of this collection, going left to right.

     Note: will not terminate for infinite-sized collections.

     Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

     B

       the result type of the binary operator.

     op

       the binary operator.

     returns

       the result of inserting `op` between consecutive elements of this collection, going left to right:

           op( op( ... op(x_1, x_2) ..., x_{n-1}), x_n)

       where `x1, ..., xn` are the elements of this collection.

     Definition Classes
       TraversableForwarder → TraversableOnce
     Exceptions thrown
       `UnsupportedOperationException`

       if this collection is empty.

140. #### def reduceLeftOption[B >: A](op: (B, A) ⇒ B): Option[B]

     Optionally applies a binary operator to all elements of this collection, going left to right.

     Optionally applies a binary operator to all elements of this collection, going left to right.

     Note: will not terminate for infinite-sized collections.

     Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

     B

       the result type of the binary operator.

     op

       the binary operator.

     returns

       an option value containing the result of `reduceLeft(op)` is this collection is nonempty, `None` otherwise.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce

141. #### def reduceOption[A1 >: A](op: (A1, A1) ⇒ A1): Option[A1]

     Reduces the elements of this traversable or iterator, if any, using the specified associative binary operator.

     Reduces the elements of this traversable or iterator, if any, using the specified associative binary operator.

     The order in which operations are performed on elements is unspecified and may be nondeterministic.

     A1

       A type parameter for the binary operator, a supertype of `A`.

     op

       A binary operator that must be associative.

     returns

       An option value containing result of applying reduce operator `op` between all the elements if the collection is nonempty, and `None` otherwise.

     Definition Classes
       TraversableOnce → GenTraversableOnce

142. #### def reduceRight[B >: A](op: (A, B) ⇒ B): B

     Applies a binary operator to all elements of this collection, going right to left.

     Applies a binary operator to all elements of this collection, going right to left.

     Note: will not terminate for infinite-sized collections.

     Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

     B

       the result type of the binary operator.

     op

       the binary operator.

     returns

       the result of inserting `op` between consecutive elements of this collection, going right to left:

           op(x_1, op(x_2, ..., op(x_{n-1}, x_n)...))

       where `x1, ..., xn` are the elements of this collection.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce
     Exceptions thrown
       `UnsupportedOperationException`

       if this collection is empty.

143. #### def reduceRightOption[B >: A](op: (A, B) ⇒ B): Option[B]

     Optionally applies a binary operator to all elements of this collection, going right to left.

     Optionally applies a binary operator to all elements of this collection, going right to left.

     Note: will not terminate for infinite-sized collections.

     Note: might return different results for different runs, unless the underlying collection type is ordered. or the operator is associative and commutative.

     B

       the result type of the binary operator.

     op

       the binary operator.

     returns

       an option value containing the result of `reduceRight(op)` is this collection is nonempty, `None` otherwise.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce

144. #### def remove(n: Int): A

     Removes the element on a given index position.

     Removes the element on a given index position. May take time linear in the buffer size.

     n

       the index which refers to the element to delete.

     returns

       n the element that was formerly at position `n`.

     Definition Classes
       ListBuffer → BufferLike
     Exceptions thrown
       Predef.IndexOutOfBoundsException

       if `n` is out of bounds.

     Note

       an element must exists at position `n`.

145. #### def remove(n: Int, count: Int): Unit

     Removes a given number of elements on a given index position.

     Removes a given number of elements on a given index position. May take time linear in the buffer size.

     n

       the index which refers to the first element to remove.

     count

       the number of elements to remove.

     Definition Classes
       ListBuffer → BufferLike
     Annotations
       @migration
     Migration

       (Changed in version 2.11) Invalid input values will be rejected in future releases.

146. #### def repr: ListBuffer[A]

     The collection of type traversable collection underlying this `TraversableLike` object.

     The collection of type traversable collection underlying this `TraversableLike` object. By default this is implemented as the `TraversableLike` object itself, but this can be overridden.

     Definition Classes
       TraversableLike → GenTraversableLike

147. #### def result(): immutable.List[A]

     Produces a collection from the added elements.

     Produces a collection from the added elements. The builder's contents are undefined after this operation.

     returns

       a collection containing the elements added to this builder.

     Definition Classes
       ListBuffer → Builder

148. #### def reverse: ListBuffer[A]

     Returns new sequence with elements in reversed order.

     Returns new sequence with elements in reversed order.

     Note: will not terminate for infinite-sized collections.

     returns

       A new sequence with all elements of this sequence in reversed order.

     Definition Classes
       SeqLike → GenSeqLike

149. #### def reverseIterator: Iterator[A]

     An iterator yielding elements in reversed order.

     An iterator yielding elements in reversed order.

     Note: will not terminate for infinite-sized collections.

     Note: `xs.reverseIterator` is the same as `xs.reverse.iterator` but might be more efficient.

     returns

       an iterator yielding the elements of this sequence in reversed order

     Definition Classes
       SeqForwarder → SeqLike

150. #### def reverseMap[B](f: (A) ⇒ B): ListBuffer[B]

     [use case] Builds a new collection by applying a function to all elements of this list buffer and collecting the results in reversed order.

     [use case]

     Builds a new collection by applying a function to all elements of this list buffer and collecting the results in reversed order.

     Note: `xs.reverseMap(f)` is the same as `xs.reverse.map(f)` but might be more efficient.

     B

       the element type of the returned collection.

     f

       the function to apply to each element.

     returns

       a new list buffer resulting from applying the given function `f` to each element of this list buffer and collecting the results in reversed order.

     Definition Classes
       SeqLike → GenSeqLike
     Full Signature

     #### def reverseMap[B, That](f: (A) ⇒ B)(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

151. #### def reversed: List[A]

     Attributes
       protected[this]
     Definition Classes
       TraversableOnce

152. #### def runWith[U](action: (A) ⇒ U): (Int) ⇒ Boolean

     Composes this partial function with an action function which gets applied to results of this partial function.

     Composes this partial function with an action function which gets applied to results of this partial function. The action function is invoked only for its side effects; its result is ignored.

     Note that expression `pf.runWith(action)(x)` is equivalent to

         if(pf isDefinedAt x) { action(pf(x)); true } else false

     except that `runWith` is implemented via `applyOrElse` and thus potentially more efficient. Using `runWith` avoids double evaluation of pattern matchers and guards for partial function literals.

     action

       the action function

     returns

       a function which maps arguments `x` to `isDefinedAt(x)`. The resulting function runs `action(this(x))` where `this` is defined.

     Definition Classes
       PartialFunction
     Since

       2.10

     See also

       `applyOrElse`.

153. #### def sameElements(that: GenIterable[A]): Boolean

     [use case] Checks if the other iterable collection contains the same elements in the same order as this list buffer.

     [use case]

     Checks if the other iterable collection contains the same elements in the same order as this list buffer.

     that

       the collection to compare with.

     returns

       `true`, if both collections contain the same elements in the same order, `false` otherwise.

     Definition Classes
       IterableForwarder → IterableLike → GenIterableLike
     Full Signature

     #### def sameElements[B >: A](that: GenIterable[B]): Boolean

154. #### def scan[B >: A, That](z: B)(op: (B, B) ⇒ B)(implicit cbf: CanBuildFrom[ListBuffer[A], B, That]): That

     Computes a prefix scan of the elements of the collection.

     Computes a prefix scan of the elements of the collection.

     Note: The neutral element `z` may be applied more than once.

     B

       element type of the resulting collection

     That

       type of the resulting collection

     z

       neutral element for the operator `op`

     op

       the associative operator for the scan

     cbf

       combiner factory which provides a combiner

     returns

       a new traversable collection containing the prefix scan of the elements in this traversable collection

     Definition Classes
       TraversableLike → GenTraversableLike

155. #### def scanLeft[B, That](z: B)(op: (B, A) ⇒ B)(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

     Produces a collection containing cumulative results of applying the operator going left to right.

     Produces a collection containing cumulative results of applying the operator going left to right.

     Note: will not terminate for infinite-sized collections.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     B

       the type of the elements in the resulting collection

     That

       the actual type of the resulting collection

     z

       the initial value

     op

       the binary operator applied to the intermediate result and the element

     bf

       an implicit value of class `CanBuildFrom` which determines the result class `That` from the current representation type `Repr` and and the new element type `B`.

     returns

       collection with intermediate results

     Definition Classes
       TraversableLike → GenTraversableLike

156. #### def scanRight[B, That](z: B)(op: (A, B) ⇒ B)(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

     Produces a collection containing cumulative results of applying the operator going right to left.

     Produces a collection containing cumulative results of applying the operator going right to left. The head of the collection is the last cumulative result.

     Note: will not terminate for infinite-sized collections.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     Example:

         List(1, 2, 3, 4).scanRight(0)(_ + _) == List(10, 9, 7, 4, 0)

     B

       the type of the elements in the resulting collection

     That

       the actual type of the resulting collection

     z

       the initial value

     op

       the binary operator applied to the intermediate result and the element

     bf

       an implicit value of class `CanBuildFrom` which determines the result class `That` from the current representation type `Repr` and and the new element type `B`.

     returns

       collection with intermediate results

     Definition Classes
       TraversableLike → GenTraversableLike
     Annotations
       @migration
     Migration

       (Changed in version 2.9.0) The behavior of `scanRight` has changed. The previous behavior can be reproduced with scanRight.reverse.

157. #### def segmentLength(p: (A) ⇒ Boolean, from: Int): Int

     Computes length of longest segment whose elements all satisfy some predicate.

     Computes length of longest segment whose elements all satisfy some predicate.

     Note: may not terminate for infinite-sized collections.

     p

       the predicate used to test elements.

     from

       the index where the search starts.

     returns

       the length of the longest segment of this sequence starting from index `from` such that every element of the segment satisfies the predicate `p`.

     Definition Classes
       SeqForwarder → SeqLike → GenSeqLike

158. #### def seq: Seq[A]

     A version of this collection with all of the operations implemented sequentially (i.

     A version of this collection with all of the operations implemented sequentially (i.e. in a single-threaded manner).

     This method returns a reference to this collection. In parallel collections, it is redefined to return a sequential implementation of this collection. In both cases, it has O(1) complexity.

     returns

       a sequential view of the collection.

     Definition Classes
       Seq → Seq → GenSeq → GenSeqLike → Iterable → Iterable → GenIterable → Traversable → Traversable → GenTraversable → Parallelizable → TraversableOnce → GenTraversableOnce

159. #### def size: Int

     The size of this list buffer.

     The size of this list buffer.

     returns

       the number of elements in this list buffer.

     Definition Classes
       ListBuffer → TraversableForwarder → SeqLike → GenTraversableLike → TraversableOnce → GenTraversableOnce

160. #### def sizeHint(coll: TraversableLike[_, _], delta: Int): Unit

     Gives a hint that one expects the `result` of this builder to have the same size as the given collection, plus some delta.

     Gives a hint that one expects the `result` of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection is known to have a cheap `size` method. Currently this is assumed to be the case if and only if the collection is of type `IndexedSeqLike`. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

     coll

       the collection which serves as a hint for the result's size.

     delta

       a correction to add to the `coll.size` to produce the size hint.

     Definition Classes
       Builder

161. #### def sizeHint(coll: TraversableLike[_, _]): Unit

     Gives a hint that one expects the `result` of this builder to have the same size as the given collection, plus some delta.

     Gives a hint that one expects the `result` of this builder to have the same size as the given collection, plus some delta. This will provide a hint only if the collection is known to have a cheap `size` method. Currently this is assumed to be the case if and only if the collection is of type `IndexedSeqLike`. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

     coll

       the collection which serves as a hint for the result's size.

     Definition Classes
       Builder

162. #### def sizeHint(size: Int): Unit

     Gives a hint how many elements are expected to be added when the next `result` is called.

     Gives a hint how many elements are expected to be added when the next `result` is called. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

     size

       the hint how many elements will be added.

     Definition Classes
       Builder

163. #### def sizeHintBounded(size: Int, boundingColl: TraversableLike[_, _]): Unit

     Gives a hint how many elements are expected to be added when the next `result` is called, together with an upper bound given by the size of some other collection.

     Gives a hint how many elements are expected to be added when the next `result` is called, together with an upper bound given by the size of some other collection. Some builder classes will optimize their representation based on the hint. However, builder implementations are still required to work correctly even if the hint is wrong, i.e. a different number of elements is added.

     size

       the hint how many elements will be added.

     boundingColl

       the bounding collection. If it is an IndexedSeqLike, then sizes larger than collection's size are reduced.

     Definition Classes
       Builder

164. #### def slice(from: Int, until: Int): ListBuffer[A]

     Selects an interval of elements.

     Selects an interval of elements. The returned collection is made up of all elements `x` which satisfy the invariant:

         from <= indexOf(x) < until

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     returns

       a iterable collection containing the elements greater than or equal to index `from` extending up to (but not including) index `until` of this iterable collection.

     Definition Classes
       IterableLike → TraversableLike → GenTraversableLike

165. #### def sliding(size: Int, step: Int): Iterator[ListBuffer[A]]

     Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.

     Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

     size

       the number of elements per group

     step

       the distance between the first elements of successive groups (defaults to 1)

     returns

       An iterator producing iterable collections of size `size`, except the last and the only element will be truncated if there are fewer elements than size.

     Definition Classes
       IterableLike
     See also

       scala.collection.Iterator, method `sliding`

166. #### def sliding(size: Int): Iterator[ListBuffer[A]]

     Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.

     Groups elements in fixed size blocks by passing a "sliding window" over them (as opposed to partitioning them, as is done in grouped.)

     size

       the number of elements per group

     returns

       An iterator producing iterable collections of size `size`, except the last and the only element will be truncated if there are fewer elements than size.

     Definition Classes
       IterableLike
     See also

       scala.collection.Iterator, method `sliding`

167. #### def sortBy[B](f: (A) ⇒ B)(implicit ord: math.Ordering[B]): ListBuffer[A]

     Sorts this `Seq` according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.

     Sorts this `Seq` according to the Ordering which results from transforming an implicitly given Ordering with a transformation function.

     B

       the target type of the transformation `f`, and the type where the ordering `ord` is defined.

     f

       the transformation function mapping elements to some other domain `B`.

     ord

       the ordering assumed on domain `B`.

     returns

       a sequence consisting of the elements of this sequence sorted according to the ordering where `x < y` if `ord.lt(f(x), f(y))`.

     Definition Classes
       SeqLike
     Example:

     1.     val words = "The quick brown fox jumped over the lazy dog".split(' ')
            // this works because scala.Ordering will implicitly provide an Ordering[Tuple2[Int, Char]]
            words.sortBy(x => (x.length, x.head))
            res0: Array[String] = Array(The, dog, fox, the, lazy, over, brown, quick, jumped)

     See also

       scala.math.Ordering

       Note: will not terminate for infinite-sized collections.

168. #### def sortWith(lt: (A, A) ⇒ Boolean): ListBuffer[A]

     Sorts this sequence according to a comparison function.

     Sorts this sequence according to a comparison function.

     Note: will not terminate for infinite-sized collections.

     The sort is stable. That is, elements that are equal (as determined by `lt`) appear in the same order in the sorted sequence as in the original.

     lt

       the comparison function which tests whether its first argument precedes its second argument in the desired ordering.

     returns

       a sequence consisting of the elements of this sequence sorted according to the comparison function `lt`.

     Definition Classes
       SeqLike
     Example:

     1.     List("Steve", "Tom", "John", "Bob").sortWith(_.compareTo(_) < 0) =
            List("Bob", "John", "Steve", "Tom")

169. #### def sorted[B >: A](implicit ord: math.Ordering[B]): ListBuffer[A]

     Sorts this sequence according to an Ordering.

     Sorts this sequence according to an Ordering.

     The sort is stable. That is, elements that are equal (as determined by `lt`) appear in the same order in the sorted sequence as in the original.

     ord

       the ordering to be used to compare elements.

     returns

       a sequence consisting of the elements of this sequence sorted according to the ordering `ord`.

     Definition Classes
       SeqLike
     See also

       scala.math.Ordering

170. #### def span(p: (A) ⇒ Boolean): (ListBuffer[A], ListBuffer[A])

     Splits this traversable collection into a prefix/suffix pair according to a predicate.

     Splits this traversable collection into a prefix/suffix pair according to a predicate.

     Note: `c span p` is equivalent to (but possibly more efficient than) `(c takeWhile p, c dropWhile p)`, provided the evaluation of the predicate `p` does not cause any side-effects.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     returns

       a pair consisting of the longest prefix of this traversable collection whose elements all satisfy `p`, and the rest of this traversable collection.

     Definition Classes
       TraversableLike → GenTraversableLike

171. #### def splitAt(n: Int): (ListBuffer[A], ListBuffer[A])

     Splits this traversable collection into two at a given position.

     Splits this traversable collection into two at a given position. Note: `c splitAt n` is equivalent to (but possibly more efficient than) `(c take n, c drop n)`.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     n

       the position at which to split.

     returns

       a pair of traversable collections consisting of the first `n` elements of this traversable collection, and the other elements.

     Definition Classes
       TraversableLike → GenTraversableLike

172. #### def startsWith[B](that: GenSeq[B]): Boolean

     Tests whether this sequence starts with the given sequence.

     Tests whether this sequence starts with the given sequence.

     that

       the sequence to test

     returns

       `true` if this collection has `that` as a prefix, `false` otherwise.

     Definition Classes
       SeqForwarder → GenSeqLike

173. #### def startsWith[B](that: GenSeq[B], offset: Int): Boolean

     Tests whether this sequence contains the given sequence at a given index.

     Tests whether this sequence contains the given sequence at a given index.

     Note: If the both the receiver object `this` and the argument `that` are infinite sequences this method may not terminate.

     that

       the sequence to test

     offset

       the index where the sequence is searched.

     returns

       `true` if the sequence `that` is contained in this sequence at index `offset`, otherwise `false`.

     Definition Classes
       SeqForwarder → SeqLike → GenSeqLike

174. #### def stringPrefix: String

     Defines the prefix of the string representation.

     Defines the prefix of the string representation.

     returns

       the string representation of this buffer.

     Definition Classes
       ListBuffer → BufferLike → TraversableLike → GenTraversableLike

175. #### def sum: A

     [use case] Sums up the elements of this collection.

     [use case]

     Sums up the elements of this collection.

     returns

       the sum of all elements in this list buffer of numbers of type `Int`. Instead of `Int`, any other type `T` with an implicit `Numeric[T]` implementation can be used as element type of the list buffer and as result type of `sum`. Examples of such types are: `Long`, `Float`, `Double`, `BigInt`.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce
     Full Signature

     #### def sum[B >: A](implicit num: Numeric[B]): B

176. #### final def synchronized[T0](arg0: ⇒ T0): T0

     Definition Classes
       AnyRef

177. #### def tail: ListBuffer[A]

     Selects all elements except the first.

     Selects all elements except the first.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     returns

       a traversable collection consisting of all elements of this traversable collection except the first one.

     Definition Classes
       TraversableLike → GenTraversableLike
     Exceptions thrown
       `UnsupportedOperationException`

       if the traversable collection is empty.

178. #### def tails: Iterator[ListBuffer[A]]

     Iterates over the tails of this traversable collection.

     Iterates over the tails of this traversable collection. The first value will be this traversable collection and the final one will be an empty traversable collection, with the intervening values the results of successive applications of `tail`.

     returns

       an iterator over all the tails of this traversable collection

     Definition Classes
       TraversableLike
     Example:

     1. `List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)`

179. #### def take(n: Int): ListBuffer[A]

     Selects first n elements.

     Selects first n elements.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     n

       the number of elements to take from this iterable collection.

     returns

       a iterable collection consisting only of the first `n` elements of this iterable collection, or else the whole iterable collection, if it has less than `n` elements.

     Definition Classes
       IterableLike → TraversableLike → GenTraversableLike

180. #### def takeRight(n: Int): ListBuffer[A]

     Selects last n elements.

     Selects last n elements.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     n

       the number of elements to take

     returns

       a iterable collection consisting only of the last `n` elements of this iterable collection, or else the whole iterable collection, if it has less than `n` elements.

     Definition Classes
       IterableLike

181. #### def takeWhile(p: (A) ⇒ Boolean): ListBuffer[A]

     Takes longest prefix of elements that satisfy a predicate.

     Takes longest prefix of elements that satisfy a predicate.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     returns

       the longest prefix of this iterable collection whose elements all satisfy the predicate `p`.

     Definition Classes
       IterableLike → TraversableLike → GenTraversableLike

182. #### def thisCollection: collection.Seq[A]

     The underlying collection seen as an instance of ``Seq``.

     The underlying collection seen as an instance of ``Seq``. By default this is implemented as the current collection object itself, but this can be overridden.

     Attributes
       protected[this]
     Definition Classes
       SeqLike → IterableLike → TraversableLike

183. #### def to[Col[_]]: Col[A]

     [use case] Converts this list buffer into another by copying all elements.

     [use case]

     Converts this list buffer into another by copying all elements.

     Col

       The collection type to build.

     returns

       a new collection containing all elements of this list buffer.

     Definition Classes
       TraversableLike → TraversableOnce → GenTraversableOnce
     Full Signature

     #### def to[Col[_]](implicit cbf: CanBuildFrom[Nothing, A, Col[A]]): Col[A]

184. #### def toArray: Array[A]

     [use case] Converts this list buffer to an array.

     [use case]

     Converts this list buffer to an array.

     returns

       an array containing all elements of this list buffer. An `ClassTag` must be available for the element type of this list buffer.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce
     Full Signature

     #### def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]

185. #### def toBuffer[B >: A]: Buffer[B]

     Uses the contents of this collection to create a new mutable buffer.

     Uses the contents of this collection to create a new mutable buffer.

     Note: will not terminate for infinite-sized collections.

     returns

       a buffer containing all elements of this collection.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce

186. #### def toCollection(repr: ListBuffer[A]): collection.Seq[A]

     A conversion from collections of type `Repr` to ``Seq`` objects.

     A conversion from collections of type `Repr` to ``Seq`` objects. By default this is implemented as just a cast, but this can be overridden.

     Attributes
       protected[this]
     Definition Classes
       SeqLike → IterableLike → TraversableLike

187. #### def toIndexedSeq: immutable.IndexedSeq[A]

     Converts this collection to an indexed sequence.

     Converts this collection to an indexed sequence.

     Note: will not terminate for infinite-sized collections.

     returns

       an indexed sequence containing all elements of this collection.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce

188. #### def toIterable: collection.Iterable[A]

     Converts this collection to an iterable collection.

     Converts this collection to an iterable collection. Note that the choice of target `Iterable` is lazy in this default implementation as this `TraversableOnce` may be lazy and unevaluated (i.e. it may be an iterator which is only traversable once).

     Note: will not terminate for infinite-sized collections.

     returns

       an `Iterable` containing all elements of this collection.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce

189. #### def toIterator: Iterator[A]

     Returns an Iterator over the elements in this iterable collection.

     Returns an Iterator over the elements in this iterable collection. Produces the same result as `iterator`.

     Note: will not terminate for infinite-sized collections.

     returns

       an Iterator containing all elements of this iterable collection.

     Definition Classes
       IterableLike → TraversableLike → GenTraversableOnce
     Annotations
       @deprecatedOverriding( ... , "2.11.0" )

190. #### def toList: immutable.List[A]

     Converts this buffer to a list.

     Converts this buffer to a list. Takes constant time. The buffer is copied lazily, the first time it is mutated.

     returns

       a list containing all elements of this list buffer.

     Definition Classes
       ListBuffer → TraversableForwarder → TraversableOnce → GenTraversableOnce

191. #### def toMap[T, U]: collection.Map[T, U]

     [use case] Converts this list buffer to a map.

     [use case]

     Converts this list buffer to a map. This method is unavailable unless the elements are members of Tuple2, each ((T, U)) becoming a key-value pair in the map. Duplicate keys will be overwritten by later keys: if this is an unordered collection, which key is in the resulting map is undefined.

     returns

       a map of type `immutable.Map[T, U]` containing all key/value pairs of type `(T, U)` of this list buffer.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce
     Full Signature

     #### def toMap[T, U](implicit ev: <:<[A, (T, U)]): immutable.Map[T, U]

192. #### def toParArray: ParArray[T]

     Implicit information
       This member is added by an implicit conversion from ListBuffer[A] to CollectionsHaveToParArray[ListBuffer[A], T] performed by method CollectionsHaveToParArray in scala.collection.parallel. This conversion will take place only if an implicit value of type (ListBuffer[A]) ⇒ GenTraversableOnce[T] is in scope.
     Definition Classes
       CollectionsHaveToParArray

193. #### def toSeq: collection.Seq[A]

     Converts this collection to a sequence.

     Converts this collection to a sequence. As with `toIterable`, it's lazy in this default implementation, as this `TraversableOnce` may be lazy and unevaluated.

     Note: will not terminate for infinite-sized collections.

     returns

       a sequence containing all elements of this collection.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce

194. #### def toSet[B >: A]: immutable.Set[B]

     Converts this collection to a set.

     Converts this collection to a set.

     Note: will not terminate for infinite-sized collections.

     returns

       a set containing all elements of this collection.

     Definition Classes
       TraversableForwarder → TraversableOnce → GenTraversableOnce

195. #### def toStream: immutable.Stream[A]

     Converts this collection to a stream.

     Converts this collection to a stream.

     returns

       a stream containing all elements of this collection.

     Definition Classes
       TraversableForwarder → TraversableLike → GenTraversableOnce

196. #### def toString(): String

     Converts this sequence to a string.

     Converts this sequence to a string.

     returns

       a string representation of this collection. By default this string consists of the `stringPrefix` of this sequence, followed by all elements separated by commas and enclosed in parentheses.

     Definition Classes
       SeqLike → TraversableLike → Any

197. #### def toTraversable: collection.Traversable[A]

     Converts this traversable collection to an unspecified Traversable.

     Converts this traversable collection to an unspecified Traversable. Will return the same collection if this instance is already Traversable.

     Note: will not terminate for infinite-sized collections.

     returns

       a Traversable containing all elements of this traversable collection.

     Definition Classes
       TraversableLike → TraversableOnce → GenTraversableOnce
     Annotations
       @deprecatedOverriding( ... , "2.11.0" )

198. #### def toVector: Vector[A]

     Converts this traversable or iterator to a Vector.

     Converts this traversable or iterator to a Vector.

     Note: will not terminate for infinite-sized collections.

     returns

       a vector containing all elements of this traversable or iterator.

     Definition Classes
       TraversableOnce → GenTraversableOnce

199. #### def transform(f: (A) ⇒ A): ListBuffer.this.type

     Applies a transformation function to all values contained in this sequence.

     Applies a transformation function to all values contained in this sequence. The transformation function produces new values from existing elements.

     f

       the transformation to apply

     returns

       the sequence itself.

     Definition Classes
       SeqLike

200. #### def transpose[B](implicit asTraversable: (A) ⇒ GenTraversableOnce[B]): ListBuffer[ListBuffer[B]]

     Transposes this collection of traversable collections into a collection of collections.

     Transposes this collection of traversable collections into a collection of collections.

     The resulting collection's type will be guided by the static type of collection. For example:

         val xs = List(
                    Set(1, 2, 3),
                    Set(4, 5, 6)).transpose
         // xs == List(
         //         List(1, 4),
         //         List(2, 5),
         //         List(3, 6))

         val ys = Vector(
                    List(1, 2, 3),
                    List(4, 5, 6)).transpose
         // ys == Vector(
         //         Vector(1, 4),
         //         Vector(2, 5),
         //         Vector(3, 6))

     B

       the type of the elements of each traversable collection.

     asTraversable

       an implicit conversion which asserts that the element type of this collection is a `Traversable`.

     returns

       a two-dimensional collection of collections which has as nth row the nth column of this collection.

     Definition Classes
       GenericTraversableTemplate
     Annotations
       @migration
     Migration

       (Changed in version 2.9.0) `transpose` throws an `IllegalArgumentException` if collections are not uniformly sized.

     Exceptions thrown
       `IllegalArgumentException`

       if all collections in this collection are not of the same size.

201. #### def trimEnd(n: Int): Unit

     Removes the last n elements of this buffer.

     Removes the last n elements of this buffer.

     n

       the number of elements to remove from the end of this buffer.

     Definition Classes
       BufferLike

202. #### def trimStart(n: Int): Unit

     Removes the first n elements of this buffer.

     Removes the first n elements of this buffer.

     n

       the number of elements to remove from the beginning of this buffer.

     Definition Classes
       BufferLike

203. #### def underlying: immutable.List[A]

     The iterable object to which calls are forwarded

     The iterable object to which calls are forwarded

     Attributes
       protected
     Definition Classes
       ListBuffer → SeqForwarder → IterableForwarder → TraversableForwarder

204. #### def union(that: collection.Seq[A]): ListBuffer[A]

     [use case] Produces a new sequence which contains all elements of this list buffer and also all elements of a given sequence.

     [use case]

     Produces a new sequence which contains all elements of this list buffer and also all elements of a given sequence. `xs union ys` is equivalent to `xs ++ ys`.

     Another way to express this is that `xs union ys` computes the order-presevring multi-set union of `xs` and `ys`. `union` is hence a counter-part of `diff` and `intersect` which also work on multi-sets.

     that

       the sequence to add.

     returns

       a new list buffer which contains all elements of this list buffer followed by all elements of `that`.

     Definition Classes
       SeqLike → GenSeqLike
     Full Signature

     #### def union[B >: A, That](that: GenSeq[B])(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

205. #### def unzip[A1, A2](implicit asPair: (A) ⇒ (A1, A2)): (ListBuffer[A1], ListBuffer[A2])

     Converts this collection of pairs into two collections of the first and second half of each pair.

     Converts this collection of pairs into two collections of the first and second half of each pair.

         val xs = CC(
                    (1, "one"),
                    (2, "two"),
                    (3, "three")).unzip
         // xs == (CC(1, 2, 3),
         //        CC(one, two, three))

     A1

       the type of the first half of the element pairs

     A2

       the type of the second half of the element pairs

     asPair

       an implicit conversion which asserts that the element type of this collection is a pair.

     returns

       a pair of collections, containing the first, respectively second half of each element pair of this collection.

     Definition Classes
       GenericTraversableTemplate

206. #### def unzip3[A1, A2, A3](implicit asTriple: (A) ⇒ (A1, A2, A3)): (ListBuffer[A1], ListBuffer[A2], ListBuffer[A3])

     Converts this collection of triples into three collections of the first, second, and third element of each triple.

     Converts this collection of triples into three collections of the first, second, and third element of each triple.

         val xs = CC(
                    (1, "one", '1'),
                    (2, "two", '2'),
                    (3, "three", '3')).unzip3
         // xs == (CC(1, 2, 3),
         //        CC(one, two, three),
         //        CC(1, 2, 3))

     A1

       the type of the first member of the element triples

     A2

       the type of the second member of the element triples

     A3

       the type of the third member of the element triples

     asTriple

       an implicit conversion which asserts that the element type of this collection is a triple.

     returns

       a triple of collections, containing the first, second, respectively third member of each element triple of this collection.

     Definition Classes
       GenericTraversableTemplate

207. #### def update(n: Int, x: A): Unit

     Replaces element at index `n` with the new element `newelem`.

     Replaces element at index `n` with the new element `newelem`. Takes time linear in the buffer size. (except the first element, which is updated in constant time).

     n

       the index of the element to replace.

     x

       the new element.

     Definition Classes
       ListBuffer → BufferLike → SeqLike
     Exceptions thrown
       Predef.IndexOutOfBoundsException

       if `n` is out of bounds.

208. #### def updated(index: Int, elem: A): ListBuffer[A]

     [use case] A copy of this list buffer with one single replaced element.

     [use case]

     A copy of this list buffer with one single replaced element.

     index

       the position of the replacement

     elem

       the replacing element

     returns

       a copy of this list buffer with the element at position `index` replaced by `elem`.

     Definition Classes
       SeqLike → GenSeqLike
     Full Signature

     #### def updated[B >: A, That](index: Int, elem: B)(implicit bf: CanBuildFrom[ListBuffer[A], B, That]): That

209. #### def view(from: Int, until: Int): SeqView[A, ListBuffer[A]]

     Creates a non-strict view of a slice of this sequence.

     Creates a non-strict view of a slice of this sequence.

     Note: the difference between `view` and `slice` is that `view` produces a view of the current sequence, whereas `slice` produces a new sequence.

     Note: `view(from, to)` is equivalent to `view.slice(from, to)`

     from

       the index of the first element of the view

     until

       the index of the element following the view

     returns

       a non-strict view of a slice of this sequence, starting at index `from` and extending up to (but not including) index `until`.

     Definition Classes
       SeqLike → IterableLike → TraversableLike

210. #### def view: SeqView[A, ListBuffer[A]]

     Creates a non-strict view of this sequence.

     Creates a non-strict view of this sequence.

     returns

       a non-strict view of this sequence.

     Definition Classes
       SeqLike → IterableLike → TraversableLike

211. #### final def wait(): Unit

     Definition Classes
       AnyRef
     Annotations
       @throws( ... )

212. #### final def wait(arg0: Long, arg1: Int): Unit

     Definition Classes
       AnyRef
     Annotations
       @throws( ... )

213. #### final def wait(arg0: Long): Unit

     Definition Classes
       AnyRef
     Annotations
       @throws( ... )

214. #### def withFilter(p: (A) ⇒ Boolean): FilterMonadic[A, ListBuffer[A]]

     Creates a non-strict filter of this traversable collection.

     Creates a non-strict filter of this traversable collection.

     Note: the difference between `c filter p` and `c withFilter p` is that the former creates a new collection, whereas the latter only restricts the domain of subsequent `map`, `flatMap`, `foreach`, and `withFilter` operations.

     Note: might return different results for different runs, unless the underlying collection type is ordered.

     p

       the predicate used to test elements.

     returns

       an object of class `WithFilter`, which supports `map`, `flatMap`, `foreach`, and `withFilter` operations. All these operations apply to those elements of this traversable collection which satisfy the predicate `p`.

     Definition Classes
       TraversableLike → FilterMonadic

215. #### def zip[B](that: GenIterable[B]): ListBuffer[(A, B)]

     [use case] Returns a list buffer formed from this list buffer and another iterable collection by combining corresponding elements in pairs.

     [use case]

     Returns a list buffer formed from this list buffer and another iterable collection by combining corresponding elements in pairs. If one of the two collections is longer than the other, its remaining elements are ignored.

     B

       the type of the second half of the returned pairs

     that

       The iterable providing the second half of each result pair

     returns

       a new list buffer containing pairs consisting of corresponding elements of this list buffer and `that`. The length of the returned collection is the minimum of the lengths of this list buffer and `that`.

     Definition Classes
       IterableLike → GenIterableLike
     Full Signature

     #### def zip[A1 >: A, B, That](that: GenIterable[B])(implicit bf: CanBuildFrom[ListBuffer[A], (A1, B), That]): That

216. #### def zipAll[B](that: collection.Iterable[B], thisElem: A, thatElem: B): ListBuffer[(A, B)]

     [use case] Returns a list buffer formed from this list buffer and another iterable collection by combining corresponding elements in pairs.

     [use case]

     Returns a list buffer formed from this list buffer and another iterable collection by combining corresponding elements in pairs. If one of the two collections is shorter than the other, placeholder elements are used to extend the shorter collection to the length of the longer.

     B

       the type of the second half of the returned pairs

     that

       The iterable providing the second half of each result pair

     thisElem

       the element to be used to fill up the result if this list buffer is shorter than `that`.

     thatElem

       the element to be used to fill up the result if `that` is shorter than this list buffer.

     returns

       a new list buffer containing pairs consisting of corresponding elements of this list buffer and `that`. The length of the returned collection is the maximum of the lengths of this list buffer and `that`. If this list buffer is shorter than `that`, `thisElem` values are used to pad the result. If `that` is shorter than this list buffer, `thatElem` values are used to pad the result.

     Definition Classes
       IterableLike → GenIterableLike
     Full Signature

     #### def zipAll[B, A1 >: A, That](that: GenIterable[B], thisElem: A1, thatElem: B)(implicit bf: CanBuildFrom[ListBuffer[A], (A1, B), That]): That

217. #### def zipWithIndex: ListBuffer[(A, Int)]

     [use case] Zips this list buffer with its indices.

     [use case]

     Zips this list buffer with its indices.

     returns

       A new list buffer containing pairs consisting of all elements of this list buffer paired with their index. Indices start at `0`.

     Definition Classes
       IterableLike → GenIterableLike
     Full Signature

     #### def zipWithIndex[A1 >: A, That](implicit bf: CanBuildFrom[ListBuffer[A], (A1, Int), That]): That

     Example:

     1. `List("a", "b", "c").zipWithIndex = List(("a", 0), ("b", 1), ("c", 2))`

218. #### def →[B](y: B): (ListBuffer[A], B)

     Implicit information
       This member is added by an implicit conversion from ListBuffer[A] to ArrowAssoc[ListBuffer[A]] performed by method ArrowAssoc in scala.Predef.
     Definition Classes
       ArrowAssoc

### Shadowed Implicit Value Members

1. #### def filter(p: (A) ⇒ Boolean): TraversableOnce[A]

   Implicit information
     This member is added by an implicit conversion from ListBuffer[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (listBuffer: MonadOps[A]).filter(p)

   Definition Classes
     MonadOps

2. #### def flatMap[B](f: (A) ⇒ GenTraversableOnce[B]): TraversableOnce[B]

   Implicit information
     This member is added by an implicit conversion from ListBuffer[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (listBuffer: MonadOps[A]).flatMap(f)

   Definition Classes
     MonadOps

3. #### def map[B](f: (A) ⇒ B): TraversableOnce[B]

   Implicit information
     This member is added by an implicit conversion from ListBuffer[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (listBuffer: MonadOps[A]).map(f)

   Definition Classes
     MonadOps

4. #### def withFilter(p: (A) ⇒ Boolean): Iterator[A]

   Implicit information
     This member is added by an implicit conversion from ListBuffer[A] to MonadOps[A] performed by method MonadOps in scala.collection.TraversableOnce.
   Shadowing
     This implicitly inherited member is shadowed by one or more members in this class.
     To access this member you can use a type ascription:

         (listBuffer: MonadOps[A]).withFilter(p)

   Definition Classes
     MonadOps

### Deprecated Value Members

1. #### def <<(cmd: Message[A]): Unit

   Send a message to this scriptable object.

   Send a message to this scriptable object.

   cmd

     the message to send.

   Definition Classes
     BufferLike → Scriptable
   Annotations
     @deprecated
   Deprecated

     (Since version 2.11.0) Scripting is deprecated.

2. #### def readOnly: immutable.List[A]

   Returns the current evolving(!) state of this buffer as a read-only sequence.

   Returns the current evolving(!) state of this buffer as a read-only sequence.

   returns

     A sequence that forwards to this buffer for all its operations.

   Definition Classes
     ListBuffer → BufferLike
   Annotations
     @deprecated
   Deprecated

     (Since version 2.11.0) The result of this method will change along with this buffer, which is often not what's expected.

### Inherited from java.io.Serializable

### Inherited from SeqForwarder[A]

### Inherited from IterableForwarder[A]

### Inherited from TraversableForwarder[A]

### Inherited from Builder[A, immutable.List[A]]

### Inherited from AbstractBuffer[A]

### Inherited from Buffer[A]

### Inherited from BufferLike[A, ListBuffer[A]]

### Inherited from Subtractable[A, ListBuffer[A]]

### Inherited from Scriptable[A]

### Inherited from Shrinkable[A]

### Inherited from Growable[A]

### Inherited from Clearable

### Inherited from AbstractSeq[A]

### Inherited from Seq[A]

### Inherited from SeqLike[A, ListBuffer[A]]

### Inherited from Cloneable[ListBuffer[A]]

### Inherited from scala.Cloneable

### Inherited from java.lang.Cloneable

### Inherited from Iterable[A]

### Inherited from Traversable[A]

### Inherited from Mutable

### Inherited from collection.AbstractSeq[A]

### Inherited from collection.Seq[A]

### Inherited from collection.SeqLike[A, ListBuffer[A]]

### Inherited from GenSeq[A]

### Inherited from GenSeqLike[A, ListBuffer[A]]

### Inherited from PartialFunction[Int, A]

### Inherited from (Int) ⇒ A

### Inherited from collection.AbstractIterable[A]

### Inherited from collection.Iterable[A]

### Inherited from IterableLike[A, ListBuffer[A]]

### Inherited from Equals

### Inherited from GenIterable[A]

### Inherited from GenIterableLike[A, ListBuffer[A]]

### Inherited from AbstractTraversable[A]

### Inherited from collection.Traversable[A]

### Inherited from GenTraversable[A]

### Inherited from GenericTraversableTemplate[A, ListBuffer]

### Inherited from TraversableLike[A, ListBuffer[A]]

### Inherited from GenTraversableLike[A, ListBuffer[A]]

### Inherited from Parallelizable[A, ParSeq[A]]

### Inherited from TraversableOnce[A]

### Inherited from GenTraversableOnce[A]

### Inherited from FilterMonadic[A, ListBuffer[A]]

### Inherited from HasNewBuilder[A, scala.collection.mutable.ListBuffer[A] @scala.annotation.unchecked.uncheckedVariance]

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion CollectionsHaveToParArray from ListBuffer[A] to CollectionsHaveToParArray[ListBuffer[A], T]

### Inherited by implicit conversion MonadOps from ListBuffer[A] to MonadOps[A]

### Inherited by implicit conversion any2stringadd from ListBuffer[A] to any2stringadd[ListBuffer[A]]

### Inherited by implicit conversion StringFormat from ListBuffer[A] to StringFormat[ListBuffer[A]]

### Inherited by implicit conversion Ensuring from ListBuffer[A] to Ensuring[ListBuffer[A]]

### Inherited by implicit conversion ArrowAssoc from ListBuffer[A] to ArrowAssoc[ListBuffer[A]]

### Inherited by implicit conversion alternateImplicit from ListBuffer[A] to ForceImplicitAmbiguity

### Ungrouped