Trait

scala

Function1

Related Doc: package scala

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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 the difference between Function1 and scala.PartialFunction is that the latter can specify inputs which it will not handle.

Self Type
(T1) ⇒ R
Annotations
@implicitNotFound( msg = ... )
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
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Inherited
  1. Function1
  2. AnyRef
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Visibility
  1. Public
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Abstract Value Members

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

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    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

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    Definition Classes
    AnyRef → Any

  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any

  3. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

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

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    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()

  5. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any

  6. def clone(): AnyRef

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

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

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    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()

  8. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef

  9. def equals(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  10. def finalize(): Unit

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

  11. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any

  12. def hashCode(): Int

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    Definition Classes
    AnyRef → Any

  13. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any

  14. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef

  15. final def notify(): Unit

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    Definition Classes
    AnyRef

  16. final def notifyAll(): Unit

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    Definition Classes
    AnyRef

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

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    Definition Classes
    AnyRef

  18. def toString(): String

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    Definition Classes
    Function1 → AnyRef → Any

  19. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

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

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  21. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

Inherited from AnyRef

Inherited from Any

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