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
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Inherited
  1. Function1
  2. AnyRef
  3. Any
Implicitly
  1. by any2stringadd
  2. by StringFormat
  3. by Ensuring
  4. by ArrowAssoc
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  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]

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