Packages

sealed abstract class Option[+A] extends IterableOnce[A] with Product with Serializable

Represents optional values. Instances of Option are either an instance of scala.Some or the object None.

The most idiomatic way to use an scala.Option instance is to treat it as a collection or monad and use map,flatMap, filter, or foreach:

val name: Option[String] = request getParameter "name"
val upper = name map { _.trim } filter { _.length != 0 } map { _.toUpperCase }
println(upper getOrElse "")

Note that this is equivalent to

val upper = for {
  name <- request getParameter "name"
  trimmed <- Some(name.trim)
  upper <- Some(trimmed.toUpperCase) if trimmed.length != 0
} yield upper
println(upper getOrElse "")

Because of how for comprehension works, if None is returned from request.getParameter, the entire expression results in None

This allows for sophisticated chaining of scala.Option values without having to check for the existence of a value.

These are useful methods that exist for both scala.Some and None.

  • isDefined — True if not empty
  • isEmpty — True if empty
  • nonEmpty — True if not empty
  • orElse — Evaluate and return alternate optional value if empty
  • getOrElse — Evaluate and return alternate value if empty
  • get — Return value, throw exception if empty
  • fold — Apply function on optional value, return default if empty
  • map — Apply a function on the optional value
  • flatMap — Same as map but function must return an optional value
  • foreach — Apply a procedure on option value
  • collect — Apply partial pattern match on optional value
  • filter — An optional value satisfies predicate
  • filterNot — An optional value doesn't satisfy predicate
  • exists — Apply predicate on optional value, or false if empty
  • forall — Apply predicate on optional value, or true if empty
  • contains — Checks if value equals optional value, or false if empty
  • zip — Combine two optional values to make a paired optional value
  • unzip — Split an optional pair to two optional values
  • unzip3 — Split an optional triple to three optional values
  • toList — Unary list of optional value, otherwise the empty list

A less-idiomatic way to use scala.Option values is via pattern matching:

val nameMaybe = request getParameter "name"
nameMaybe match {
  case Some(name) =>
    println(name.trim.toUppercase)
  case None =>
    println("No name value")
}

Interacting with code that can occasionally return null can be safely wrapped in scala.Option to become None and scala.Some otherwise.

val abc = new java.util.HashMap[Int, String]
abc.put(1, "A")
bMaybe = Option(abc.get(2))
bMaybe match {
  case Some(b) =>
    println(s"Found $b")
  case None =>
    println("Not found")
}
Self Type
Option[A]
Annotations
@SerialVersionUID()
Source
Option.scala
Note

Many of the methods in here are duplicative with those in the Traversable hierarchy, but they are duplicated for a reason: the implicit conversion tends to leave one with an Iterable in situations where one could have retained an Option.

Known Subclasses
Type Hierarchy
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  1. Alphabetic
  2. By Inheritance
Inherited
  1. Option
  2. Serializable
  3. Product
  4. Equals
  5. IterableOnce
  6. AnyRef
  7. Any
Implicitly
  1. by option2Iterable
  2. by iterableOnceExtensionMethods
  3. by any2stringadd
  4. by StringFormat
  5. by Ensuring
  6. by ArrowAssoc
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Visibility
  1. Public
  2. Protected

Type Members

  1. class WithFilter extends AnyRef

    We need a whole WithFilter class to honor the "doesn't create a new collection" contract even though it seems unlikely to matter much in a collection with max size 1.

Abstract Value Members

  1. abstract def canEqual(that: Any): Boolean

    A method that should be called from every well-designed equals method that is open to be overridden in a subclass.

    A method that should be called from every well-designed equals method that is open to be overridden in a subclass. See Programming in Scala, Chapter 28 for discussion and design.

    that

    the value being probed for possible equality

    returns

    true if this instance can possibly equal that, otherwise false

    Definition Classes
    Equals
  2. abstract def get: A

    Returns the option's value.

    Returns the option's value.

    This is equivalent to:

    option match {
      case Some(x) => x
      case None    => throw new Exception
    }
    Exceptions thrown

    java.util.NoSuchElementException if the option is empty.

    Note

    The option must be nonempty.

  3. abstract def productArity: Int

    The size of this product.

    The size of this product.

    returns

    for a product A(x1, ..., xk), returns k

    Definition Classes
    Product
  4. abstract def productElement(n: Int): Any

    The nth element of this product, 0-based.

    The nth element of this product, 0-based. In other words, for a product A(x1, ..., xk), returns x(n+1) where 0 <= n < k.

    n

    the index of the element to return

    returns

    the element n elements after the first element

    Definition Classes
    Product
    Exceptions thrown

    IndexOutOfBoundsException if the n is out of range(n < 0 || n >= productArity).

Concrete Value Members

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

    Test two objects for inequality.

    Test two objects for inequality.

    returns

    true if !(this == that), false otherwise.

    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

    Equivalent to x.hashCode except for boxed numeric types and null.

    Equivalent to x.hashCode except for boxed numeric types and null. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For null returns a hashcode where null.hashCode throws a NullPointerException.

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  3. def +(other: String): String
    Implicit
    This member is added by an implicit conversion from Option[A] toany2stringadd[Option[A]] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. final def ++[B >: A](suffix: collection.IterableOnce[B]): collection.Iterable[B]

    Alias for concat

    Alias for concat

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    Annotations
    @inline()
  5. def ->[B](y: B): (Option[A], B)
    Implicit
    This member is added by an implicit conversion from Option[A] toArrowAssoc[Option[A]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @inline()
  6. final def ==(arg0: Any): Boolean

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    AnyRef → Any
  7. final def addString(b: collection.mutable.StringBuilder): collection.mutable.StringBuilder

    Appends all elements of this iterable collection to a string builder.

    Appends all elements of this iterable collection to a string builder. The written text consists of the string representations (w.r.t. the method toString) of all elements of this iterable 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.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  8. final def addString(b: collection.mutable.StringBuilder, sep: String): collection.mutable.StringBuilder

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

    Appends all elements of this iterable 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 iterable 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.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
    Annotations
    @inline()
  9. def addString(b: collection.mutable.StringBuilder, start: String, sep: String, end: String): collection.mutable.StringBuilder

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

    Appends all elements of this iterable 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 iterable 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.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  10. final def asInstanceOf[T0]: T0

    Cast the receiver object to be of type T0.

    Cast the receiver object to be of type T0.

    Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String] will throw a ClassCastException at runtime, while the expression List(1).asInstanceOf[List[String]] will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

    ClassCastException if the receiver object is not an instance of the erasure of type T0.

  11. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

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

    not specified by SLS as a member of AnyRef

  12. final def collect[B](pf: PartialFunction[A, B]): Option[B]

    Returns a scala.Some containing the result of applying pf to this scala.Option's contained value, if this option is nonempty and pf is defined for that value.

    Returns a scala.Some containing the result of applying pf to this scala.Option's contained value, if this option is nonempty and pf is defined for that value. Returns None otherwise.

    pf

    the partial function.

    returns

    the result of applying pf to this scala.Option's value (if possible), or None.

    Annotations
    @inline()
    Example:
    1. // Returns Some(HTTP) because the partial function covers the case.
      Some("http") collect {case "http" => "HTTP"}
      
      // Returns None because the partial function doesn't cover the case.
      Some("ftp") collect {case "http" => "HTTP"}
      
      // Returns None because the option is empty. There is no value to pass to the partial function.
      None collect {case value => value}
  13. def collectFirst[B](pf: PartialFunction[A, B]): Option[B]

    Finds the first element of the iterable collection for which the given partial function is defined, and applies the partial function to it.

    Finds the first element of the iterable collection 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.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
    Example:
    1. Seq("a", 1, 5L).collectFirst({ case x: Int => x*10 }) = Some(10)

  14. def concat[B >: A](suffix: collection.IterableOnce[B]): collection.Iterable[B]

    Returns a new iterable collection containing the elements from the left hand operand followed by the elements from the right hand operand.

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

    B

    the element type of the returned collection.

    suffix

    the traversable to append.

    returns

    a new iterable collection which contains all elements of this iterable collection followed by all elements of suffix.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  15. final def contains[A1 >: A](elem: A1): Boolean

    Tests whether the option contains a given value as an element.

    Tests whether the option contains a given value as an element.

    This is equivalent to:

    option match {
      case Some(x) => x == elem
      case None    => false
    }
    elem

    the element to test.

    returns

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

    Example:
    1. // Returns true because Some instance contains string "something" which equals "something".
      Some("something") contains "something"
      
      // Returns false because "something" != "anything".
      Some("something") contains "anything"
      
      // Returns false when method called on None.
      None contains "anything"
  16. def copyToArray[B >: A](xs: Array[B], start: Int, len: Int): Int

    Copy elements to an array, returning the number of elements written.

    Copy elements to an array, returning the number of elements written.

    Fills the given array xs starting at index start with at most len elements of this iterable collection.

    Copying will stop once either all the elements of this iterable collection have been copied, or the end of the array is reached, or len elements have been copied.

    B

    the type of the elements of the array.

    xs

    the array to fill.

    start

    the starting index of xs.

    len

    the maximal number of elements to copy.

    returns

    the number of elements written to the array

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
    Note

    Reuse: After calling this method, one should discard the iterator it was called on. Using it is undefined and subject to change. Note: will not terminate for infinite-sized collections.

  17. def copyToArray[B >: A](xs: Array[B], start: Int): Int

    Copy elements to an array, returning the number of elements written.

    Copy elements to an array, returning the number of elements written.

    Fills the given array xs starting at index start with values of this iterable collection.

    Copying will stop once either all the elements of this iterable collection have been copied, or the end of the array is reached.

    B

    the type of the elements of the array.

    xs

    the array to fill.

    start

    the starting index of xs.

    returns

    the number of elements written to the array Note: will not terminate for infinite-sized collections.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  18. def copyToArray[B >: A](xs: Array[B]): Int

    Copy elements to an array, returning the number of elements written.

    Copy elements to an array, returning the number of elements written.

    Fills the given array xs starting at index start with values of this iterable collection.

    Copying will stop once either all the elements of this iterable collection have been copied, or the end of the array is reached.

    B

    the type of the elements of the array.

    xs

    the array to fill.

    returns

    the number of elements written to the array Note: will not terminate for infinite-sized collections.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  19. def corresponds[B](that: collection.IterableOnce[B])(p: (A, B) => Boolean): Boolean

    Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.

    Tests whether every element of this collection's iterator relates to the corresponding element of another collection by satisfying a test predicate.

    B

    the type of the elements of that

    that

    the other collection

    p

    the test predicate, which relates elements from both collections

    returns

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

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  20. def drop(n: Int): collection.Iterable[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. If n is negative, don't drop any elements.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOpsIterableOnceOps
  21. def dropRight(n: Int): collection.Iterable[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 drop from this iterable collection.

    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. If n is negative, don't drop any elements.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  22. def dropWhile(p: (A) => Boolean): collection.Iterable[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.

    p

    The predicate used to test elements.

    returns

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

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOpsIterableOnceOps
  23. def empty: collection.Iterable[A]

    The empty iterable of the same type as this iterable

    The empty iterable of the same type as this iterable

    returns

    an empty iterable of type C.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableFactoryDefaultsIterableOps
  24. def ensuring(cond: (Option[A]) => Boolean, msg: => Any): Option[A]
    Implicit
    This member is added by an implicit conversion from Option[A] toEnsuring[Option[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  25. def ensuring(cond: (Option[A]) => Boolean): Option[A]
    Implicit
    This member is added by an implicit conversion from Option[A] toEnsuring[Option[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  26. def ensuring(cond: Boolean, msg: => Any): Option[A]
    Implicit
    This member is added by an implicit conversion from Option[A] toEnsuring[Option[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  27. def ensuring(cond: Boolean): Option[A]
    Implicit
    This member is added by an implicit conversion from Option[A] toEnsuring[Option[A]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  28. final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (that) is a reference to the receiver object (this).

    Tests whether the argument (that) is a reference to the receiver object (this).

    The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:

    • It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
    • For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
    • null.eq(null) returns true.

    When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).

    returns

    true if the argument is a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  29. def equals(arg0: AnyRef): Boolean

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to eq.

    See also equals in scala.Any.

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    AnyRef → Any
  30. final def exists(p: (A) => Boolean): Boolean

    Returns true if this option is nonempty and the predicate p returns true when applied to this scala.Option's value.

    Returns true if this option is nonempty and the predicate p returns true when applied to this scala.Option's value. Otherwise, returns false.

    This is equivalent to:

    option match {
      case Some(x) => p(x)
      case None    => false
    }
    p

    the predicate to test

    Annotations
    @inline()
  31. final def filter(p: (A) => Boolean): Option[A]

    Returns this scala.Option if it is nonempty and applying the predicate p to this scala.Option's value returns true.

    Returns this scala.Option if it is nonempty and applying the predicate p to this scala.Option's value returns true. Otherwise, return None.

    This is equivalent to:

    option match {
      case Some(x) if p(x) => Some(x)
      case _               => None
    }
    p

    the predicate used for testing.

    Annotations
    @inline()
  32. final def filterNot(p: (A) => Boolean): Option[A]

    Returns this scala.Option if it is nonempty and applying the predicate p to this scala.Option's value returns false.

    Returns this scala.Option if it is nonempty and applying the predicate p to this scala.Option's value returns false. Otherwise, return None.

    This is equivalent to:

    option match {
      case Some(x) if !p(x) => Some(x)
      case _                => None
    }
    p

    the predicate used for testing.

    Annotations
    @inline()
  33. def finalize(): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

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

    not specified by SLS as a member of AnyRef

  34. final def flatMap[B](f: (A) => Option[B]): Option[B]

    Returns the result of applying f to this scala.Option's value if this scala.Option is nonempty.

    Returns the result of applying f to this scala.Option's value if this scala.Option is nonempty. Returns None if this scala.Option is empty. Slightly different from map in that f is expected to return an scala.Option (which could be None).

    This is equivalent to:

    option match {
      case Some(x) => f(x)
      case None    => None
    }
    f

    the function to apply

    Annotations
    @inline()
    See also

    map

    foreach

  35. def flatten[B](implicit ev: <:<[A, Option[B]]): Option[B]

    Returns the nested scala.Option value if it is nonempty.

    Returns the nested scala.Option value if it is nonempty. Otherwise, return None.

    This is equivalent to:

    option match {
      case Some(Some(b)) => Some(b)
      case _             => None
    }
    ev

    an implicit conversion that asserts that the value is also an scala.Option.

    Example:
    1. Some(Some("something")).flatten
    See also

    flatMap

  36. final def fold[B](ifEmpty: => B)(f: (A) => B): B

    Returns the result of applying f to this scala.Option's value if the scala.Option is nonempty.

    Returns the result of applying f to this scala.Option's value if the scala.Option is nonempty. Otherwise, evaluates expression ifEmpty.

    This is equivalent to:

    option match {
      case Some(x) => f(x)
      case None    => ifEmpty
    }

    This is also equivalent to:

    option map f getOrElse ifEmpty
    ifEmpty

    the expression to evaluate if empty.

    f

    the function to apply if nonempty.

    Annotations
    @inline()
  37. def foldLeft[B](z: B)(op: (B, A) => B): B

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

    Applies a binary operator to a start value and all elements of this iterable 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 iterable 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 iterable collection. Returns z if this iterable collection is empty.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  38. def foldRight[B](z: B)(op: (A, B) => B): B

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

    Applies a binary operator to all elements of this iterable 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 iterable 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 iterable collection. Returns z if this iterable collection is empty.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  39. final def forall(p: (A) => Boolean): Boolean

    Returns true if this option is empty or the predicate p returns true when applied to this scala.Option's value.

    Returns true if this option is empty or the predicate p returns true when applied to this scala.Option's value.

    This is equivalent to:

    option match {
      case Some(x) => p(x)
      case None    => true
    }
    p

    the predicate to test

    Annotations
    @inline()
  40. final def foreach[U](f: (A) => U): Unit

    Apply the given procedure f to the option's value, if it is nonempty.

    Apply the given procedure f to the option's value, if it is nonempty. Otherwise, do nothing.

    This is equivalent to:

    option match {
      case Some(x) => f(x)
      case None    => ()
    }
    f

    the procedure to apply.

    Annotations
    @inline()
    See also

    map

    flatMap

  41. 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
    This member is added by an implicit conversion from Option[A] toStringFormat[Option[A]] performed by method StringFormat in scala.Predef.
    Definition Classes
    StringFormat
    Annotations
    @inline()
  42. final def getClass(): Class[_ <: AnyRef]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

    a class object corresponding to the runtime type of the receiver.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  43. final def getOrElse[B >: A](default: => B): B

    Returns the option's value if the option is nonempty, otherwise return the result of evaluating default.

    Returns the option's value if the option is nonempty, otherwise return the result of evaluating default.

    This is equivalent to:

    option match {
      case Some(x) => x
      case None    => default
    }
    default

    the default expression.

    Annotations
    @inline()
  44. def groupBy[K](f: (A) => K): Map[K, collection.Iterable[A]]

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

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

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    K

    the type of keys returned by the discriminator function.

    f

    the discriminator function.

    returns

    A map from keys to iterable 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 iterable collection of those elements x for which f(x) equals k.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  45. def groupMap[K, B](key: (A) => K)(f: (A) => B): Map[K, collection.Iterable[B]]

    Partitions this iterable collection into a map of iterable collections according to a discriminator function key.

    Partitions this iterable collection into a map of iterable collections according to a discriminator function key. Each element in a group is transformed into a value of type B using the value function.

    It is equivalent to groupBy(key).mapValues(_.map(f)), but more efficient.

    case class User(name: String, age: Int)
    
    def namesByAge(users: Seq[User]): Map[Int, Seq[String]] =
      users.groupMap(_.age)(_.name)

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    K

    the type of keys returned by the discriminator function

    B

    the type of values returned by the transformation function

    key

    the discriminator function

    f

    the element transformation function

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  46. def groupMapReduce[K, B](key: (A) => K)(f: (A) => B)(reduce: (B, B) => B): Map[K, B]

    Partitions this iterable collection into a map according to a discriminator function key.

    Partitions this iterable collection into a map according to a discriminator function key. All the values that have the same discriminator are then transformed by the value function and then reduced into a single value with the reduce function.

    It is equivalent to groupBy(key).mapValues(_.map(f).reduce(reduce)), but more efficient.

    def occurrences[A](as: Seq[A]): Map[A, Int] =
      as.groupMapReduce(identity)(_ => 1)(_ + _)

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  47. def grouped(size: Int): collection.Iterator[collection.Iterable[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.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    See also

    scala.collection.Iterator, method grouped

  48. def hashCode(): Int

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

    the hash code value for this object.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  49. def head: A

    Selects the first element of this iterable collection.

    Selects the first element of this iterable collection.

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

    returns

    the first element of this iterable collection.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException if the iterable collection is empty.

  50. 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 iterable collection if it is nonempty, None if it is empty.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  51. def init: collection.Iterable[A]

    The initial part of the collection without its last element.

    The initial part of the collection without its last element.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  52. def inits: collection.Iterator[collection.Iterable[A]]

    Iterates over the inits of this iterable collection.

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

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    returns

    an iterator over all the inits of this iterable collection

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    Example:
    1. List(1,2,3).inits = Iterator(List(1,2,3), List(1,2), List(1), Nil)

  53. final def isDefined: Boolean

    Returns true if the option is an instance of scala.Some, false otherwise.

    Returns true if the option is an instance of scala.Some, false otherwise.

    This is equivalent to:

    option match {
      case Some(_) => true
      case None    => false
    }
  54. final def isEmpty: Boolean

    Returns true if the option is None, false otherwise.

    Returns true if the option is None, false otherwise.

    This is equivalent to:

    option match {
      case Some(_) => false
      case None    => true
    }
  55. final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object is T0.

    Test whether the dynamic type of the receiver object is T0.

    Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String] will return false, while the expression List(1).isInstanceOf[List[String]] will return true. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.

    returns

    true if the receiver object is an instance of erasure of type T0; false otherwise.

    Definition Classes
    Any
  56. def isTraversableAgain: Boolean

    Tests whether this iterable collection can be repeatedly traversed.

    Tests whether this iterable collection can be repeatedly traversed. Always true for Iterables and false for Iterators unless overridden.

    returns

    true if it is repeatedly traversable, false otherwise.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOpsIterableOnceOps
  57. def iterableFactory: IterableFactory[collection.Iterable]

    The companion object of this iterable collection, providing various factory methods.

    The companion object of this iterable collection, providing various factory methods.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableIterableOps
    Note

    When implementing a custom collection type and refining CC to the new type, this method needs to be overridden to return a factory for the new type (the compiler will issue an error otherwise).

  58. def iterator: Iterator[A]

    Returns a singleton iterator returning the scala.Option's value if it is nonempty, or an empty iterator if the option is empty.

    Returns a singleton iterator returning the scala.Option's value if it is nonempty, or an empty iterator if the option is empty.

    Definition Classes
    OptionIterableOnce
  59. final def knownSize: Int

    returns

    The number of elements in this option, if it can be cheaply computed, -1 otherwise. Cheaply usually means: Not requiring a collection traversal.

    Definition Classes
    OptionIterableOnce
  60. 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 iterable collection.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    Exceptions thrown

    NoSuchElementException If the iterable collection is empty.

  61. 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 iterable collection$ if it is nonempty, None if it is empty.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  62. def lazyZip[B]: ([B](that: Iterable[B])scala.collection.LazyZip2[A,B,_1.type]) forSome {val _1: collection.Iterable[A]}

    Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

    Analogous to zip except that the elements in each collection are not consumed until a strict operation is invoked on the returned LazyZip2 decorator.

    Calls to lazyZip can be chained to support higher arities (up to 4) without incurring the expense of constructing and deconstructing intermediary tuples.

    val xs = List(1, 2, 3)
    val res = (xs lazyZip xs lazyZip xs lazyZip xs).map((a, b, c, d) => a + b + c + d)
    // res == List(4, 8, 12)
    B

    the type of the second element in each eventual pair

    returns

    a decorator LazyZip2 that allows strict operations to be performed on the lazily evaluated pairs or chained calls to lazyZip. Implicit conversion to Iterable[(A, B)] is also supported.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    Iterable
  63. final def map[B](f: (A) => B): Option[B]

    Returns a scala.Some containing the result of applying f to this scala.Option's value if this scala.Option is nonempty.

    Returns a scala.Some containing the result of applying f to this scala.Option's value if this scala.Option is nonempty. Otherwise return None.

    This is equivalent to:

    option match {
      case Some(x) => Some(f(x))
      case None    => None
    }
    f

    the function to apply

    Annotations
    @inline()
    Note

    This is similar to flatMap except here, f does not need to wrap its result in an scala.Option.

    See also

    flatMap

    foreach

  64. def max[B >: A](implicit ord: math.Ordering[B]): A

    Finds the largest element.

    Finds the largest element.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

    the largest element of this iterable collection with respect to the ordering ord.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterable collection is empty.

  65. def maxBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A

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

    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.

    cmp

    An ordering to be used for comparing elements.

    returns

    the first element of this iterable collection with the largest value measured by function f with respect to the ordering cmp.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterable collection is empty.

  66. def maxByOption[B](f: (A) => B)(implicit cmp: math.Ordering[B]): Option[A]

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

    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.

    cmp

    An ordering to be used for comparing elements.

    returns

    an option value containing the first element of this iterable collection with the largest value measured by function f with respect to the ordering cmp.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  67. def maxOption[B >: A](implicit ord: math.Ordering[B]): Option[A]

    Finds the largest element.

    Finds the largest element.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

    an option value containing the largest element of this iterable collection with respect to the ordering ord.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  68. def min[B >: A](implicit ord: math.Ordering[B]): A

    Finds the smallest element.

    Finds the smallest element.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

    the smallest element of this iterable collection with respect to the ordering ord.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterable collection is empty.

  69. def minBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A

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

    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.

    cmp

    An ordering to be used for comparing elements.

    returns

    the first element of this iterable collection with the smallest value measured by function f with respect to the ordering cmp.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterable collection is empty.

  70. def minByOption[B](f: (A) => B)(implicit cmp: math.Ordering[B]): Option[A]

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

    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.

    cmp

    An ordering to be used for comparing elements.

    returns

    an option value containing the first element of this iterable collection with the smallest value measured by function f with respect to the ordering cmp.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  71. def minOption[B >: A](implicit ord: math.Ordering[B]): Option[A]

    Finds the smallest element.

    Finds the smallest element.

    B

    The type over which the ordering is defined.

    ord

    An ordering to be used for comparing elements.

    returns

    an option value containing the smallest element of this iterable collection with respect to the ordering ord.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  72. final def ne(arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

    true if the argument is not a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  73. final def nonEmpty: Boolean

    Returns false if the option is None, true otherwise.

    Returns false if the option is None, true otherwise.

    This is equivalent to:

    option match {
      case Some(_) => true
      case None    => false
    }
    Note

    Implemented here to avoid the implicit conversion to Iterable.

  74. final def notify(): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  75. final def notifyAll(): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  76. final def orElse[B >: A](alternative: => Option[B]): Option[B]

    Returns this scala.Option if it is nonempty, otherwise return the result of evaluating alternative.

    Returns this scala.Option if it is nonempty, otherwise return the result of evaluating alternative.

    This is equivalent to:

    option match {
      case Some(x) => Some(x)
      case None    => alternative
    }
    alternative

    the alternative expression.

    Annotations
    @inline()
  77. final def orNull[A1 >: A](implicit ev: <:<[Null, A1]): A1

    Returns the option's value if it is nonempty, or null if it is empty.

    Returns the option's value if it is nonempty, or null if it is empty.

    Although the use of null is discouraged, code written to use scala.Option must often interface with code that expects and returns nulls.

    This is equivalent to:

    option match {
      case Some(x) => x
      case None    => null
    }
    Annotations
    @inline()
    Example:
    1. val initialText: Option[String] = getInitialText
      val textField = new JComponent(initialText.orNull,20)
  78. def partition(p: (A) => Boolean): (collection.Iterable[A], collection.Iterable[A])

    A pair of, first, all elements that satisfy predicate p and, second, all elements that do not.

    A pair of, first, all elements that satisfy predicate p and, second, all elements that do not. Interesting because it splits a collection in two.

    The default implementation provided here needs to traverse the collection twice. Strict collections have an overridden version of partition in StrictOptimizedIterableOps, which requires only a single traversal.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  79. def partitionMap[A1, A2](f: (A) => Either[A1, A2]): (collection.Iterable[A1], collection.Iterable[A2])

    Applies a function f to each element of the iterable collection and returns a pair of iterable collections: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

    Applies a function f to each element of the iterable collection and returns a pair of iterable collections: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

    Example:

    val xs = `Iterable`(1, "one", 2, "two", 3, "three") partitionMap {
     case i: Int => Left(i)
     case s: String => Right(s)
    }
    // xs == (`Iterable`(1, 2, 3),
    //        `Iterable`(one, two, three))
    A1

    the element type of the first resulting collection

    A2

    the element type of the second resulting collection

    f

    the 'split function' mapping the elements of this iterable collection to an scala.util.Either

    returns

    a pair of iterable collections: the first one made of those values returned by f that were wrapped in scala.util.Left, and the second one made of those wrapped in scala.util.Right.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  80. def product[B >: A](implicit num: math.Numeric[B]): B

    Multiplies up the elements of this collection.

    Multiplies up the elements of this collection.

    B

    the result type of the * operator.

    num

    an implicit parameter defining a set of numeric operations which includes the * operator to be used in forming the product.

    returns

    the product of all elements of this iterable collection with respect to the * operator in num.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  81. def productElementName(n: Int): String

    The name of the nth element of this product, 0-based.

    The name of the nth element of this product, 0-based. In the default implementation, an empty string.

    n

    the index of the element name to return

    returns

    the name of the specified element

    Definition Classes
    Product
    Exceptions thrown

    IndexOutOfBoundsException if the n is out of range(n < 0 || n >= productArity).

  82. def productElementNames: Iterator[String]

    An iterator over the names of all the elements of this product.

    An iterator over the names of all the elements of this product.

    Definition Classes
    Product
  83. def productIterator: Iterator[Any]

    An iterator over all the elements of this product.

    An iterator over all the elements of this product.

    returns

    in the default implementation, an Iterator[Any]

    Definition Classes
    Product
  84. def productPrefix: String

    A string used in the toString methods of derived classes.

    A string used in the toString methods of derived classes. Implementations may override this method to prepend a string prefix to the result of toString methods.

    returns

    in the default implementation, the empty string

    Definition Classes
    Product
  85. def reduce[B >: A](op: (B, B) => B): B

    Reduces the elements of this iterable collection using the specified associative binary operator.

    Reduces the elements of this iterable collection using the specified associative binary operator.

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

    B

    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 iterable collection is nonempty.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterable collection is empty.

  86. def reduceLeft[B >: A](op: (B, A) => B): B

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

    Applies a binary operator to all elements of this iterable 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 iterable 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 iterable collection.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterable collection is empty.

  87. def reduceLeftOption[B >: A](op: (B, A) => B): Option[B]

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

    Optionally applies a binary operator to all elements of this iterable 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) if this iterable collection is nonempty, None otherwise.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  88. def reduceOption[B >: A](op: (B, B) => B): Option[B]

    Reduces the elements of this iterable collection, if any, using the specified associative binary operator.

    Reduces the elements of this iterable collection, if any, using the specified associative binary operator.

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

    B

    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.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  89. def reduceRight[B >: A](op: (A, B) => B): B

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

    Applies a binary operator to all elements of this iterable 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 iterable 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 iterable collection.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
    Exceptions thrown

    UnsupportedOperationException if this iterable collection is empty.

  90. def reduceRightOption[B >: A](op: (A, B) => B): Option[B]

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

    Optionally applies a binary operator to all elements of this iterable 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) if this iterable collection is nonempty, None otherwise.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  91. def scan[B >: A](z: B)(op: (B, B) => B): collection.Iterable[B]

    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

    z

    neutral element for the operator op

    op

    the associative operator for the scan

    returns

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

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  92. def scanLeft[B](z: B)(op: (B, A) => B): collection.Iterable[B]

    Produces a iterable collection containing cumulative results of applying the operator going left to right, including the initial value.

    Produces a iterable collection containing cumulative results of applying the operator going left to right, including the initial value.

    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

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOpsIterableOnceOps
  93. def scanRight[B](z: B)(op: (A, B) => B): collection.Iterable[B]

    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.

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    Example:

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

    the type of the elements in the resulting collection

    z

    the initial value

    op

    the binary operator applied to the intermediate result and the element

    returns

    collection with intermediate results

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  94. def sizeCompare(that: collection.Iterable[_]): Int

    Compares the size of this iterable collection to the size of another Iterable.

    Compares the size of this iterable collection to the size of another Iterable.

    that

    the Iterable whose size is compared with this iterable collection's size.

    returns

    A value x where

    x <  0       if this.size <  that.size
    x == 0       if this.size == that.size
    x >  0       if this.size >  that.size

    The method as implemented here does not call size directly; its running time is O(this.size min that.size) instead of O(this.size + that.size). The method should be overridden if computing size is cheap and knownSize returns -1.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  95. def sizeCompare(otherSize: Int): Int

    Compares the size of this iterable collection to a test value.

    Compares the size of this iterable collection to a test value.

    otherSize

    the test value that gets compared with the size.

    returns

    A value x where

    x <  0       if this.size <  otherSize
    x == 0       if this.size == otherSize
    x >  0       if this.size >  otherSize

    The method as implemented here does not call size directly; its running time is O(size min otherSize) instead of O(size). The method should be overridden if computing size is cheap and knownSize returns -1.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    See also

    sizeIs

  96. final def sizeIs: SizeCompareOps

    Returns a value class containing operations for comparing the size of this iterable collection to a test value.

    Returns a value class containing operations for comparing the size of this iterable collection to a test value.

    These operations are implemented in terms of sizeCompare(Int), and allow the following more readable usages:

    this.sizeIs < size     // this.sizeCompare(size) < 0
    this.sizeIs <= size    // this.sizeCompare(size) <= 0
    this.sizeIs == size    // this.sizeCompare(size) == 0
    this.sizeIs != size    // this.sizeCompare(size) != 0
    this.sizeIs >= size    // this.sizeCompare(size) >= 0
    this.sizeIs > size     // this.sizeCompare(size) > 0
    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    Annotations
    @inline()
  97. def slice(from: Int, until: Int): collection.Iterable[A]

    Selects an interval of elements.

    Selects an interval of elements. The returned iterable 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.

    from

    the lowest index to include from this iterable collection.

    until

    the lowest index to EXCLUDE from this iterable collection.

    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.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOpsIterableOnceOps
  98. def sliding(size: Int, step: Int): collection.Iterator[collection.Iterable[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.)

    The returned iterator will be empty when called on an empty collection. The last element the iterator produces may be smaller than the window size when the original collection isn't exhausted by the window before it and its last element isn't skipped by the step before it.

    size

    the number of elements per group

    step

    the distance between the first elements of successive groups

    returns

    An iterator producing iterable collections of size size, except the last element (which may be the only element) will be smaller if there are fewer than size elements remaining to be grouped.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    Examples:
    1. List(1, 2, 3, 4, 5).sliding(2, 2) = Iterator(List(1, 2), List(3, 4), List(5))

    2. ,
    3. List(1, 2, 3, 4, 5, 6).sliding(2, 3) = Iterator(List(1, 2), List(4, 5))

    See also

    scala.collection.Iterator, method sliding

  99. def sliding(size: Int): collection.Iterator[collection.Iterable[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.)

    An empty collection returns an empty iterator, and a non-empty collection containing fewer elements than the window size returns an iterator that will produce the original collection as its only element.

    size

    the number of elements per group

    returns

    An iterator producing iterable collections of size size, except for a non-empty collection with less than size elements, which returns an iterator that produces the source collection itself as its only element.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    Examples:
    1. List().sliding(2) = empty iterator

    2. ,
    3. List(1).sliding(2) = Iterator(List(1))

    4. ,
    5. List(1, 2).sliding(2) = Iterator(List(1, 2))

    6. ,
    7. List(1, 2, 3).sliding(2) = Iterator(List(1, 2), List(2, 3))

    See also

    scala.collection.Iterator, method sliding

  100. def span(p: (A) => Boolean): (collection.Iterable[A], collection.Iterable[A])

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

    Splits this iterable 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.

    p

    the test predicate

    returns

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

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOpsIterableOnceOps
  101. def splitAt(n: Int): (collection.Iterable[A], collection.Iterable[A])

    Splits this iterable collection into a prefix/suffix pair at a given position.

    Splits this iterable collection into a prefix/suffix pair 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 iterable collections consisting of the first n elements of this iterable collection, and the other elements.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOpsIterableOnceOps
  102. def stepper[S <: Stepper[_]](implicit shape: StepperShape[A, S]): S

    Returns a scala.collection.Stepper for the elements of this collection.

    Returns a scala.collection.Stepper for the elements of this collection.

    The Stepper enables creating a Java stream to operate on the collection, see scala.jdk.StreamConverters. For collections holding primitive values, the Stepper can be used as an iterator which doesn't box the elements.

    The implicit scala.collection.StepperShape parameter defines the resulting Stepper type according to the element type of this collection.

    Note that this method is overridden in subclasses and the return type is refined to S with EfficientSplit, for example scala.collection.IndexedSeqOps.stepper. For Steppers marked with scala.collection.Stepper.EfficientSplit, the converters in scala.jdk.StreamConverters allow creating parallel streams, whereas bare Steppers can be converted only to sequential streams.

    Definition Classes
    IterableOnce
  103. def sum[B >: A](implicit num: math.Numeric[B]): B

    Sums up the elements of this collection.

    Sums up the elements of this collection.

    B

    the result type of the + operator.

    num

    an implicit parameter defining a set of numeric operations which includes the + operator to be used in forming the sum.

    returns

    the sum of all elements of this iterable collection with respect to the + operator in num.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  104. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  105. def tail: collection.Iterable[A]

    The rest of the collection without its first element.

    The rest of the collection without its first element.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  106. def tails: collection.Iterator[collection.Iterable[A]]

    Iterates over the tails of this iterable collection.

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

    returns

    an iterator over all the tails of this iterable collection

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    Example:
    1. List(1,2,3).tails = Iterator(List(1,2,3), List(2,3), List(3), Nil)

  107. def take(n: Int): collection.Iterable[A]

    Selects the first n elements.

    Selects the 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. If n is negative, returns an empty iterable collection.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOpsIterableOnceOps
  108. def takeRight(n: Int): collection.Iterable[A]

    Selects the last n elements.

    Selects the 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 from this iterable collection.

    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. If n is negative, returns an empty iterable collection.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  109. def takeWhile(p: (A) => Boolean): collection.Iterable[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.

    p

    The predicate used to test elements.

    returns

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

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOpsIterableOnceOps
  110. def tapEach[U](f: (A) => U): collection.Iterable[A]

    Applies a side-effecting function to each element in this collection.

    Applies a side-effecting function to each element in this collection. Strict collections will apply f to their elements immediately, while lazy collections like Views and LazyLists will only apply f on each element if and when that element is evaluated, and each time that element is evaluated.

    U

    the return type of f

    f

    a function to apply to each element in this iterable collection

    returns

    The same logical collection as this

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOpsIterableOnceOps
  111. def to[C1](factory: Factory[A, C1]): C1

    Given a collection factory factory, convert this collection to the appropriate representation for the current element type A.

    Given a collection factory factory, convert this collection to the appropriate representation for the current element type A. Example uses:

    xs.to(List) xs.to(ArrayBuffer) xs.to(BitSet) // for xs: Iterable[Int]

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  112. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]

    Convert collection to array.

    Convert collection to array.

    Implementation note: DO NOT call Array.from from this method.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  113. final def toLeft[X](right: => X): Either[A, X]

    Returns a scala.util.Right containing the given argument right if this is empty, or a scala.util.Left containing this scala.Option's value if this scala.Option is nonempty.

    Returns a scala.util.Right containing the given argument right if this is empty, or a scala.util.Left containing this scala.Option's value if this scala.Option is nonempty.

    This is equivalent to:

    option match {
      case Some(x) => Left(x)
      case None    => Right(right)
    }
    right

    the expression to evaluate and return if this is empty

    Annotations
    @inline()
    See also

    toRight

  114. def toList: List[A]

    Returns a singleton list containing the scala.Option's value if it is nonempty, or the empty list if the scala.Option is empty.

    Returns a singleton list containing the scala.Option's value if it is nonempty, or the empty list if the scala.Option is empty.

    This is equivalent to:

    option match {
      case Some(x) => List(x)
      case None    => Nil
    }
  115. def toMap[K, V](implicit ev: <:<[A, (K, V)]): Map[K, V]
    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOnceOps
  116. final def toRight[X](left: => X): Either[X, A]

    Returns a scala.util.Left containing the given argument left if this scala.Option is empty, or a scala.util.Right containing this scala.Option's value if this is nonempty.

    Returns a scala.util.Left containing the given argument left if this scala.Option is empty, or a scala.util.Right containing this scala.Option's value if this is nonempty.

    This is equivalent to:

    option match {
      case Some(x) => Right(x)
      case None    => Left(left)
    }
    left

    the expression to evaluate and return if this is empty

    Annotations
    @inline()
    See also

    toLeft

  117. def toString(): String

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

    a String representation of the object.

    Definition Classes
    AnyRef → Any
  118. def transpose[B](implicit asIterable: (A) => collection.Iterable[B]): collection.Iterable[collection.Iterable[B]]

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

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

    The resulting collection's type will be guided by the static type of iterable 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))

    Note: Even when applied to a view or a lazy collection it will always force the elements.

    B

    the type of the elements of each iterable collection.

    asIterable

    an implicit conversion which asserts that the element type of this iterable collection is an Iterable.

    returns

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

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    Exceptions thrown

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

  119. final def unzip[A1, A2](implicit asPair: <:<[A, (A1, A2)]): (Option[A1], Option[A2])

    Converts an Option of a pair into an Option of the first element and an Option of the second element.

    Converts an Option of a pair into an Option of the first element and an Option of the second element.

    This is equivalent to:

    option match {
      case Some((x, y)) => (Some(x), Some(y))
      case _            => (None,    None)
    }
    A1

    the type of the first half of the element pair

    A2

    the type of the second half of the element pair

    asPair

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

    returns

    a pair of Options, containing, respectively, the first and second half of the element pair of this Option.

  120. final def unzip3[A1, A2, A3](implicit asTriple: <:<[A, (A1, A2, A3)]): (Option[A1], Option[A2], Option[A3])

    Converts an Option of a triple into three Options, one containing the element from each position of the triple.

    Converts an Option of a triple into three Options, one containing the element from each position of the triple.

    This is equivalent to:

    option match {
      case Some((x, y, z)) => (Some(x), Some(y), Some(z))
      case _               => (None,    None,    None)
    }
    A1

    the type of the first of three elements in the triple

    A2

    the type of the second of three elements in the triple

    A3

    the type of the third of three elements in the triple

    asTriple

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

    returns

    a triple of Options, containing, respectively, the first, second, and third elements from the element triple of this Option.

  121. def view: View[A]

    A view over the elements of this collection.

    A view over the elements of this collection.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  122. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  123. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  124. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  125. final def withFilter(p: (A) => Boolean): WithFilter

    Necessary to keep scala.Option from being implicitly converted to scala.collection.Iterable in for comprehensions.

    Necessary to keep scala.Option from being implicitly converted to scala.collection.Iterable in for comprehensions.

    Annotations
    @inline()
  126. final def zip[A1 >: A, B](that: Option[B]): Option[(A1, B)]

    Returns a scala.Some formed from this option and another option by combining the corresponding elements in a pair.

    Returns a scala.Some formed from this option and another option by combining the corresponding elements in a pair. If either of the two options is empty, None is returned.

    This is equivalent to:

    (option1, option2) match {
      case (Some(x), Some(y)) => Some((x, y))
      case _                  => None
    }
    that

    the options which is going to be zipped

    Example:
    1. // Returns Some(("foo", "bar")) because both options are nonempty.
      Some("foo") zip Some("bar")
      
      // Returns None because `that` option is empty.
      Some("foo") zip None
      
      // Returns None because `this` option is empty.
      None zip Some("bar")
  127. def zipAll[A1 >: A, B](that: collection.Iterable[B], thisElem: A1, thatElem: B): collection.Iterable[(A1, B)]

    Returns a iterable collection formed from this iterable collection and another iterable collection by combining corresponding elements in pairs.

    Returns a iterable collection formed from this iterable collection 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.

    that

    the iterable providing the second half of each result pair

    thisElem

    the element to be used to fill up the result if this iterable collection is shorter than that.

    thatElem

    the element to be used to fill up the result if that is shorter than this iterable collection.

    returns

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

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
  128. def zipWithIndex: collection.Iterable[(A, Int)]

    Zips this iterable collection with its indices.

    Zips this iterable collection with its indices.

    returns

    A new iterable collection containing pairs consisting of all elements of this iterable collection paired with their index. Indices start at 0.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOpsIterableOnceOps
    Example:
    1. List("a", "b", "c").zipWithIndex == List(("a", 0), ("b", 1), ("c", 2))

Shadowed Implicit Value Members

  1. def collect[B](pf: PartialFunction[A, B]): collection.Iterable[B]

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

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

    B

    the element type of the returned iterable collection.

    pf

    the partial function which filters and maps the iterable collection.

    returns

    a new iterable collection 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.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Shadowing
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  2. def count(p: (A) => Boolean): Int

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

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

    p

    the predicate used to test elements.

    returns

    the number of elements satisfying the predicate p.

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  3. def exists(p: (A) => Boolean): Boolean

    Tests whether a predicate holds for at least one element of this iterable collection.

    Tests whether a predicate holds for at least one element of this iterable collection.

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    true if the given predicate p is satisfied by at least one element of this iterable collection, otherwise false

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  4. def filter(pred: (A) => Boolean): collection.Iterable[A]

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

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

    returns

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

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  5. def filterNot(pred: (A) => Boolean): collection.Iterable[A]

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

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

    pred

    the predicate used to test elements.

    returns

    a new iterable collection consisting of all elements of this iterable collection that do not satisfy the given predicate pred. Their order may not be preserved.

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  6. def find(p: (A) => Boolean): Option[A]

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

    Finds the first element of the iterable 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 iterable collection that satisfies p, or None if none exists.

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  7. def flatMap[B](f: (A) => collection.IterableOnce[B]): collection.Iterable[B]

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

    Builds a new iterable collection by applying a function to all elements of this iterable collection 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 iterable collection. 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: String) => 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 iterable collection resulting from applying the given collection-valued function f to each element of this iterable collection and concatenating the results.

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  8. def flatten[B](implicit asIterable: (A) => collection.IterableOnce[B]): collection.Iterable[B]

    Converts this iterable collection of traversable collections into a iterable collection formed by the elements of these traversable collections.

    Converts this iterable collection of traversable collections into a iterable collection formed by the elements of these traversable collections.

    The resulting collection's type will be guided by the type of iterable collection. 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.

    asIterable

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

    returns

    a new iterable collection resulting from concatenating all element iterable collections.

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  9. def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1

    Folds the elements of this iterable collection using the specified associative binary operator.

    Folds the elements of this iterable collection using the specified associative binary operator. The default implementation in IterableOnce is equivalent to foldLeft but may be overridden for more efficient traversal orders.

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

    Note: will not terminate for infinite-sized collections.

    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 the fold operator op between all the elements and z, or z if this iterable collection is empty.

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  10. def forall(p: (A) => Boolean): Boolean

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

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

    Note: may not terminate for infinite-sized collections.

    p

    the predicate used to test elements.

    returns

    true if this iterable collection is empty or the given predicate p holds for all elements of this iterable collection, otherwise false.

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  11. def foreach[U](f: (A) => U): Unit

    Apply f to each element for its side effects Note: [U] parameter needed to help scalac's type inference.

    Apply f to each element for its side effects Note: [U] parameter needed to help scalac's type inference.

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  12. def isEmpty: Boolean

    Tests whether the iterable collection is empty.

    Tests whether the iterable collection is empty.

    Note: Implementations in subclasses that are not repeatedly traversable must take care not to consume any elements when isEmpty is called.

    returns

    true if the iterable collection contains no elements, false otherwise.

    Implicit
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  13. def iterator: collection.Iterator[A]

    Iterator can be used only once

    Iterator can be used only once

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  14. def knownSize: Int

    returns

    The number of elements in this iterable collection, if it can be cheaply computed, -1 otherwise. Cheaply usually means: Not requiring a collection traversal.

    Implicit
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  15. def map[B](f: (A) => B): collection.Iterable[B]

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

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

    B

    the element type of the returned iterable collection.

    f

    the function to apply to each element.

    returns

    a new iterable collection resulting from applying the given function f to each element of this iterable collection and collecting the results.

    Implicit
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  16. final def mkString: String

    Displays all elements of this iterable collection in a string.

    Displays all elements of this iterable collection in a string.

    Delegates to addString, which can be overridden.

    returns

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

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    Annotations
    @inline()
  17. final def mkString(sep: String): String

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

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

    Delegates to addString, which can be overridden.

    sep

    the separator string.

    returns

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

    Implicit
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    Annotations
    @inline()
    Example:
    1. List(1, 2, 3).mkString("|") = "1|2|3"

  18. final def mkString(start: String, sep: String, end: String): String

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

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

    Delegates to addString, which can be overridden.

    start

    the starting string.

    sep

    the separator string.

    end

    the ending string.

    returns

    a string representation of this iterable 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 iterable collection are separated by the string sep.

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

  19. def nonEmpty: Boolean

    Tests whether the iterable collection is not empty.

    Tests whether the iterable collection is not empty.

    returns

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

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    @deprecatedOverriding(message = "nonEmpty is defined as !isEmpty; override isEmpty instead", since = "2.13.0")
  20. def size: Int

    The size of this iterable collection.

    The size of this iterable collection.

    Note: will not terminate for infinite-sized collections.

    returns

    the number of elements in this iterable collection.

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  21. def stepper[S <: Stepper[_]](implicit shape: StepperShape[A, S]): S

    Returns a scala.collection.Stepper for the elements of this collection.

    Returns a scala.collection.Stepper for the elements of this collection.

    The Stepper enables creating a Java stream to operate on the collection, see scala.jdk.StreamConverters. For collections holding primitive values, the Stepper can be used as an iterator which doesn't box the elements.

    The implicit scala.collection.StepperShape parameter defines the resulting Stepper type according to the element type of this collection.

    Note that this method is overridden in subclasses and the return type is refined to S with EfficientSplit, for example scala.collection.IndexedSeqOps.stepper. For Steppers marked with scala.collection.Stepper.EfficientSplit, the converters in scala.jdk.StreamConverters allow creating parallel streams, whereas bare Steppers can be converted only to sequential streams.

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  22. final def toBuffer[B >: A]: Buffer[B]
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    @inline()
  23. def toIndexedSeq: collection.immutable.IndexedSeq[A]
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  24. final def toIterable: collection.Iterable[A]

    returns

    This collection as an Iterable[A]. No new collection will be built if this is already an Iterable[A].

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  25. def toList: collection.immutable.List[A]
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  26. def toSeq: collection.immutable.Seq[A]

    returns

    This collection as a Seq[A]. This is equivalent to to(Seq) but might be faster.

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  27. def toSet[B >: A]: Set[B]
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  28. def toString(): String

    Converts this iterable collection to a string.

    Converts this iterable collection to a string.

    returns

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

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  29. def toVector: collection.immutable.Vector[A]
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  30. def unzip[A1, A2](implicit asPair: (A) => (A1, A2)): (collection.Iterable[A1], collection.Iterable[A2])

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

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

    val xs = `Iterable`(
               (1, "one"),
               (2, "two"),
               (3, "three")).unzip
    // xs == (`Iterable`(1, 2, 3),
    //        `Iterable`(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 iterable collection is a pair.

    returns

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

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  31. def unzip3[A1, A2, A3](implicit asTriple: (A) => (A1, A2, A3)): (collection.Iterable[A1], collection.Iterable[A2], collection.Iterable[A3])

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

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

    val xs = `Iterable`(
               (1, "one", '1'),
               (2, "two", '2'),
               (3, "three", '3')).unzip3
    // xs == (`Iterable`(1, 2, 3),
    //        `Iterable`(one, two, three),
    //        `Iterable`(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 iterable collection is a triple.

    returns

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

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  32. def withFilter(p: (A) => Boolean): collection.WithFilter[A, collection.Iterable]

    Creates a non-strict filter of this iterable collection.

    Creates a non-strict filter of this iterable 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 iterable collection which satisfy the predicate p.

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  33. def zip[B](that: collection.IterableOnce[B]): collection.Iterable[(A, B)]

    Returns a iterable collection formed from this iterable collection and another iterable collection by combining corresponding elements in pairs.

    Returns a iterable collection formed from this iterable collection 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 iterable collection containing pairs consisting of corresponding elements of this iterable collection and that. The length of the returned collection is the minimum of the lengths of this iterable collection and that.

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Deprecated Value Members

  1. def ++:[B >: A](that: collection.IterableOnce[B]): collection.Iterable[B]
    Implicit
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    Definition Classes
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    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use ++ instead of ++: for collections of type Iterable

  2. final def /:[B](z: B)(op: (B, A) => B): B
    Implicit
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    Definition Classes
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    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use foldLeft instead of /:

  3. def /:[B](z: B)(op: (B, A) => B): B
    Implicit
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    Definition Classes
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    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator.foldLeft instead

  4. final def :\[B](z: B)(op: (A, B) => B): B
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  5. def :\[B](z: B)(op: (A, B) => B): B
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    Deprecated

    (Since version 2.13.0) Use .iterator.foldRight instead

  6. def aggregate[B](z: => B)(seqop: (B, A) => B, combop: (B, B) => B): B
    Implicit
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    (Since version 2.13.0) aggregate is not relevant for sequential collections. Use foldLeft(z)(seqop) instead.

  7. def collectFirst[B](f: PartialFunction[A, B]): Option[B]
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    (Since version 2.13.0) Use .iterator.collectFirst(...) instead

  8. def companion: IterableFactory[collection.Iterable]
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    Deprecated

    (Since version 2.13.0) Use iterableFactory instead

  9. final def copyToBuffer[B >: A](dest: Buffer[B]): Unit
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    (Since version 2.13.0) Use dest ++= coll instead

  10. def copyToBuffer(dest: Buffer[A]): Unit
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    (Since version 2.13.0) Use .iterator.copyToBuffer(...) instead

  11. def count(f: (A) => Boolean): Int
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  12. def exists(f: (A) => Boolean): Boolean
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  13. def filter(f: (A) => Boolean): collection.Iterator[A]
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  14. def find(p: (A) => Boolean): Option[A]
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  15. def flatMap[B](f: (A) => collection.IterableOnce[B]): collection.IterableOnce[B]
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  16. def fold[A1 >: A](z: A1)(op: (A1, A1) => A1): A1
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  17. def foldLeft[B](z: B)(op: (B, A) => B): B
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  18. def foldRight[B](z: B)(op: (A, B) => B): B
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  19. def forall(f: (A) => Boolean): Boolean
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  20. def foreach[U](f: (A) => U): Unit
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  21. def hasDefiniteSize: Boolean

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

    Tests whether this iterable 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. Non-empty Iterators usually return false even if they were created from a collection with a known finite size.

    Note: many collection methods will not work on collections of infinite sizes. The typical failure mode is an infinite loop. These methods always attempt a traversal without checking first that hasDefiniteSize returns true. However, checking hasDefiniteSize can provide an assurance that size is well-defined and non-termination is not a concern.

    returns

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

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    (Since version 2.13.0) Check .knownSize instead of .hasDefiniteSize for more actionable information (see scaladoc for details)

    See also

    method knownSize for a more useful alternative

  22. def isEmpty: Boolean
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  23. def map[B](f: (A) => B): collection.IterableOnce[B]
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  24. def max(implicit ord: math.Ordering[A]): A
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    (Since version 2.13.0) Use .iterator.max instead

  25. def maxBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
    Implicit
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    (Since version 2.13.0) Use .iterator.maxBy(...) instead

  26. def min(implicit ord: math.Ordering[A]): A
    Implicit
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    (Since version 2.13.0) Use .iterator.min instead

  27. def minBy[B](f: (A) => B)(implicit cmp: math.Ordering[B]): A
    Implicit
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    (Since version 2.13.0) Use .iterator.minBy(...) instead

  28. def mkString: String
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  29. def mkString(sep: String): String
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  30. def mkString(start: String, sep: String, end: String): String
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  31. def nonEmpty: Boolean
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  32. def product(implicit num: math.Numeric[A]): A
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    (Since version 2.13.0) Use .iterator.product instead

  33. def reduce(f: (A, A) => A): A
    Implicit
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    (Since version 2.13.0) Use .iterator.reduce(...) instead

  34. def reduceLeft(f: (A, A) => A): A
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    (Since version 2.13.0) Use .iterator.reduceLeft(...) instead

  35. def reduceLeftOption(f: (A, A) => A): Option[A]
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    (Since version 2.13.0) Use .iterator.reduceLeftOption(...) instead

  36. def reduceOption(f: (A, A) => A): Option[A]
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  37. def reduceRight(f: (A, A) => A): A
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  38. def reduceRightOption(f: (A, A) => A): Option[A]
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  39. final def repr: collection.Iterable[A]
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    (Since version 2.13.0) Use coll instead of repr in a collection implementation, use the collection value itself from the outside

  40. def sameElements[B >: A](that: collection.IterableOnce[B]): Boolean
    Implicit
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    (Since version 2.13.0) Use .iterator.sameElements instead

  41. def seq: collection.Iterable[A]
    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
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    Iterable
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    @deprecated
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    (Since version 2.13.0) Iterable.seq always returns the iterable itself

  42. def size: Int
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  43. def sum(implicit num: math.Numeric[A]): A
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    (Since version 2.13.0) Use .iterator.sum instead

  44. def to[C1](factory: Factory[A, C1]): C1
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  45. def toArray[B >: A](implicit arg0: ClassTag[B]): Array[B]
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  46. def toBuffer[B >: A]: Buffer[B]
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  47. def toIndexedSeq: collection.IndexedSeq[A]
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  48. final def toIterable: collection.Iterable[A]
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  49. final def toIterator: collection.Iterator[A]
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  50. def toIterator: collection.Iterator[A]
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  51. def toList: collection.immutable.List[A]
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  52. def toMap[K, V](implicit ev: <:<[A, (K, V)]): Map[K, V]
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  53. def toSeq: collection.immutable.Seq[A]
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  54. def toSet[B >: A]: Set[B]
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  55. final def toStream: collection.immutable.Stream[A]
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  56. def toStream: collection.immutable.Stream[A]
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  57. final def toTraversable: collection.Traversable[A]

    Converts this iterable collection to an unspecified Iterable.

    Converts this iterable collection to an unspecified Iterable. Will return the same collection if this instance is already Iterable.

    returns

    An Iterable containing all elements of this iterable collection.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (option: Iterable[A]).toTraversable
    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use toIterable instead

  58. final def toTraversable: collection.Traversable[A]
    Implicit
    This member is added by an implicit conversion from Option[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (option: IterableOnceExtensionMethods[A]).toTraversable
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator.to(Iterable) instead

  59. def toVector: collection.immutable.Vector[A]
    Implicit
    This member is added by an implicit conversion from Option[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    Shadowing
    This implicitly inherited member is ambiguous. One or more implicitly inherited members have similar signatures, so calling this member may produce an ambiguous implicit conversion compiler error.
    To access this member you can use a type ascription:
    (option: IterableOnceExtensionMethods[A]).toVector
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated @inline()
    Deprecated

    (Since version 2.13.0) Use .iterator.to(Vector) instead

  60. def view(from: Int, until: Int): View[A]

    A view over a slice of the elements of this collection.

    A view over a slice of the elements of this collection.

    Implicit
    This member is added by an implicit conversion from Option[A] toIterable[A] performed by method option2Iterable in scala.Option.
    Definition Classes
    IterableOps
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .view.slice(from, until) instead of .view(from, until)

  61. def withFilter(f: (A) => Boolean): collection.Iterator[A]
    Implicit
    This member is added by an implicit conversion from Option[A] toIterableOnceExtensionMethods[A] performed by method iterableOnceExtensionMethods in scala.collection.IterableOnce.
    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:
    (option: IterableOnceExtensionMethods[A]).withFilter(f)
    Definition Classes
    IterableOnceExtensionMethods
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use .iterator.withFilter(...) instead

  62. def [B](y: B): (Option[A], B)
    Implicit
    This member is added by an implicit conversion from Option[A] toArrowAssoc[Option[A]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc
    Annotations
    @deprecated
    Deprecated

    (Since version 2.13.0) Use -> instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.

Inherited from java.io.Serializable

Inherited from Product

Inherited from Equals

Inherited from collection.IterableOnce[A]

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion option2Iterable fromOption[A] to Iterable[A]

Inherited by implicit conversion iterableOnceExtensionMethods fromOption[A] to IterableOnceExtensionMethods[A]

Inherited by implicit conversion any2stringadd fromOption[A] to any2stringadd[Option[A]]

Inherited by implicit conversion StringFormat fromOption[A] to StringFormat[Option[A]]

Inherited by implicit conversion Ensuring fromOption[A] to Ensuring[Option[A]]

Inherited by implicit conversion ArrowAssoc fromOption[A] to ArrowAssoc[Option[A]]

Ungrouped