scala

# Function1

#### trait Function1[-T1, +R] extends AnyRef

A function of 1 parameter.

In the following example, the definition of succ is a shorthand for the anonymous class definition anonfun1:

    object Main extends App {
    val succ = (x: Int) => x + 1
    val anonfun1 = new Function1[Int, Int] {
      def apply(x: Int): Int = x + 1
    }
    assert(succ(0) == anonfun1(0))
    }

Note that `Function1` does not define a total function, as might be suggested by the existence of scala.PartialFunction. The only distinction between `Function1` and `PartialFunction` is that the latter can specify inputs which it will not handle.

Self Type
  (T1) ⇒ R
Annotations
  @implicitNotFound( msg = ... )
Source
  Function1.scala

Linear Supertypes
AnyRef, Any
Known Subclasses
::, <:<, =:=, AbstractBuffer, AbstractFunction1, AbstractMap, AbstractMap, AbstractMap, AbstractPartialFunction, AbstractSeq, AbstractSeq, AbstractSet, AbstractSet, AnyRefMap, Appended, Appended, ArrayBuffer, ArraySeq, ArrayStack, BitSet, BitSet, BitSet, BitSet1, BitSet2, BitSetLike, BitSetN, Buffer, BufferProxy, Cons, DefaultKeySet, DefaultKeySet, DefaultKeySet, DefaultKeySortedSet, DefaultKeySortedSet, DefaultMap, DefaultMap, DefaultMapModel, DoubleLinkedList, DroppedWhile, DroppedWhile, DroppedWhile, Empty, EmptyView, EmptyView, Exclusive, Filtered, Filtered, Filtered, FilteredKeys, FilteredKeys, FlatMapped, FlatMapped, Forced, Forced, GenSet, GenSetLike, HashMap, HashMap, HashMap1, HashSet, HashSet, HashTrieMap, HashTrieSet, ImmutableDefaultKeySet, ImmutableMapAdaptor, ImmutableSetAdaptor, Impl, Inclusive, Inclusive, IndexedSeq, IndexedSeq, IndexedSeq, IndexedSeqView, IntMap, LinearSeq, LinearSeq, LinearSeq, LinkedHashMap, LinkedHashSet, LinkedList, List, ListBuffer, ListMap, ListMap, ListSet, LongMap, LongMap, Map, Map, Map, Map, Map1, Map2, Map3, Map4, MapLike, MapLike, MapLike, MapProxy, MapProxy, MapProxy, MapProxyLike, Mapped, Mapped, MappedValues, MappedValues, MultiMap, MurmurHash, MutableList, Nil, Node, Node, NumericRange, ObservableBuffer, ObservableMap, ObservableSet, OpenHashMap, PagedSeq, ParHashSet, ParHashSet, ParSet, ParSet, ParSet, ParSetLike, ParSetLike, PartialFunction, Patched, Patched, Prepended, Prepended, Queue, Queue, QueueProxy, Range, ResizableArray, Reversed, Reversed, Reversed, Script, Seq, Seq, Seq, SeqForwarder, SeqProxy, SeqView, SeqViewLike, Set, Set, Set, Set1, Set2, Set3, Set4, SetLike, SetLike, SetProxy, SetProxy, SetProxy, SetProxyLike, Sliced, Sliced, Sliced, SortedMap, SortedMap, SortedMapLike, SortedSet, SortedSet, SortedSet, SortedSetLike, Stack, Stack, StackProxy, Stream, StreamView, StreamViewLike, StringBuilder, SynchronizedBuffer, SynchronizedMap, SynchronizedQueue, SynchronizedSet, SynchronizedStack, SystemProperties, TakenWhile, TakenWhile, TakenWhile, Transformed, Transformed, Transformed, TreeMap, TreeSet, TreeSet, TrieMap, UnrolledBuffer, ValueSet, Vector, WithDefault, WithDefault, WithDefault, WrappedArray, WrappedString, Zipped, Zipped, ZippedAll, ZippedAll, ofBoolean, ofByte, ofChar, ofDouble, ofFloat, ofInt, ofLong, ofRef, ofShort, ofUnit
Type Hierarchy Learn more about scaladoc diagrams
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1. Alphabetic
2. By inheritance

Inherited

1. Function1
2. AnyRef
3. Any

Implicitly

1. by any2stringadd
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc

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Visibility

1. Public
2. All

### Abstract Value Members

1. #### abstract def apply(v1: T1): R

   Apply the body of this function to the argument.

   Apply the body of this function to the argument.

   returns

     the result of function application.

### Concrete Value Members

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

   Definition Classes
     AnyRef → Any

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

   Definition Classes
     AnyRef → Any

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

   Implicit information
     This member is added by an implicit conversion from (T1) ⇒ R to any2stringadd[(T1) ⇒ R] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd

4. #### def ->[B](y: B): ((T1) ⇒ R, B)

   Implicit information
     This member is added by an implicit conversion from (T1) ⇒ R to ArrowAssoc[(T1) ⇒ R] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()

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

   Definition Classes
     AnyRef → Any

6. #### def andThen[A](g: (R) ⇒ A): (T1) ⇒ A

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

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

   A

     the result type of function `g`

   g

     a function R => A

   returns

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

   Annotations
     @unspecialized()

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

   Definition Classes
     Any

8. #### def clone(): AnyRef

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

9. #### def compose[A](g: (A) ⇒ T1): (A) ⇒ R

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

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

   A

     the type to which function `g` can be applied

   g

     a function A => T1

   returns

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

   Annotations
     @unspecialized()

10. #### def ensuring(cond: ((T1) ⇒ R) ⇒ Boolean, msg: ⇒ Any): (T1) ⇒ R

    Implicit information
      This member is added by an implicit conversion from (T1) ⇒ R to Ensuring[(T1) ⇒ R] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

11. #### def ensuring(cond: ((T1) ⇒ R) ⇒ Boolean): (T1) ⇒ R

    Implicit information
      This member is added by an implicit conversion from (T1) ⇒ R to Ensuring[(T1) ⇒ R] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

12. #### def ensuring(cond: Boolean, msg: ⇒ Any): (T1) ⇒ R

    Implicit information
      This member is added by an implicit conversion from (T1) ⇒ R to Ensuring[(T1) ⇒ R] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

13. #### def ensuring(cond: Boolean): (T1) ⇒ R

    Implicit information
      This member is added by an implicit conversion from (T1) ⇒ R to Ensuring[(T1) ⇒ R] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

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

    Definition Classes
      AnyRef

15. #### def equals(arg0: Any): Boolean

    Definition Classes
      AnyRef → Any

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

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

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

    Returns string formatted according to given `format` string.

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

    Implicit information
      This member is added by an implicit conversion from (T1) ⇒ R to StringFormat[(T1) ⇒ R] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()

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

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      AnyRef → Any

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

    Definition Classes
      Any

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      AnyRef

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

    Definition Classes
      Function1 → AnyRef → Any

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

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

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

29. #### def →[B](y: B): ((T1) ⇒ R, B)

    Implicit information
      This member is added by an implicit conversion from (T1) ⇒ R to ArrowAssoc[(T1) ⇒ R] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd from (T1) ⇒ R to any2stringadd[(T1) ⇒ R]

### Inherited by implicit conversion StringFormat from (T1) ⇒ R to StringFormat[(T1) ⇒ R]

### Inherited by implicit conversion Ensuring from (T1) ⇒ R to Ensuring[(T1) ⇒ R]

### Inherited by implicit conversion ArrowAssoc from (T1) ⇒ R to ArrowAssoc[(T1) ⇒ R]

### Ungrouped