A function of 1 parameter.
In the following example, the definition ofsucc is shorthand, conceptually, for the anonymous class definitionanonfun1, although the implementation details of how the function value is constructed may differ:
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 betweenFunction1 andscala.PartialFunction is that the latter can specify inputs which it will not handle.
Attributes
- Companion
- object
- Source
- Function1.scala
- Graph
- Supertypes
- Known subtypes
- traitSet[A]classAbstractSet[A]classBitSetclassBitSet1classBitSet2classBitSetNclassHashSet[A]classListSet[A]classSet1[A]classSet2[A]classSet3[A]classSet4[A]classTreeSet[A]traitSortedSet[A]classHashSet[A]classLinkedHashSet[A]traitSet[A]classAbstractSet[A]classBitSetclassTreeSet[A]traitSortedSet[A]traitSet[A]classAbstractSet[A]traitSortedSet[A]traitBitSettraitBitSetOps[C]classFromJavaConsumer[T]classFromJavaDoubleFunction[R]classFromJavaIntConsumerclassFromJavaIntFunction[R]classFromJavaIntPredicateclassFromJavaLongConsumerclassFromJavaLongFunction[R]classFromJavaPredicate[T]classFromJavaToDoubleFunction[T]classFromJavaToIntFunction[T]classFromJavaToLongFunction[T]classFromJavaUnaryOperator[T]traitJFunction1$mcDD$sptraitJFunction1$mcDF$sptraitJFunction1$mcDI$sptraitJFunction1$mcDJ$sptraitJFunction1$mcFD$sptraitJFunction1$mcFF$sptraitJFunction1$mcFI$sptraitJFunction1$mcFJ$sptraitJFunction1$mcID$sptraitJFunction1$mcIF$sptraitJFunction1$mcII$sptraitJFunction1$mcIJ$sptraitJFunction1$mcJD$sptraitJFunction1$mcJF$sptraitJFunction1$mcJI$sptraitJFunction1$mcJJ$sptraitJFunction1$mcVD$sptraitJFunction1$mcVF$sptraitJFunction1$mcVI$sptraitJFunction1$mcVJ$sptraitJFunction1$mcZD$sptraitJFunction1$mcZF$sptraitJFunction1$mcZI$sptraitJFunction1$mcZJ$spclassIntMap[T]classLongMap[T]classLongMap[V]classSystemPropertiestraitSeq[A]traitSeq[A]classAbstractSeq[A]classArraySeq[A]classofBooleanclassofByteclassofCharclassofDoubleclassofFloatclassofIntclassofLongclassofRef[T]classofShortclassofUnitclassLazyList[A]classList[A]class::[A]objectNilclassNumericRange[T]classExclusive[T]classInclusive[T]classQueue[A]classRangeclassExclusiveclassInclusiveclassStream[A]classCons[A]objectEmptyclassVector[A]classWrappedStringtraitIndexedSeq[A]traitLinearSeq[A]traitSeq[A]classAbstractSeq[A]classAbstractBuffer[A]classArrayBuffer[A]classArrayDeque[A]classQueue[A]classStack[A]classListBuffer[A]classUnrolledBuffer[T]classArraySeq[T]classofBooleanclassofByteclassofCharclassofDoubleclassofFloatclassofIntclassofLongclassofRef[T]classofShortclassofUnitclassStringBuildertraitBuffer[A]traitIndexedBuffer[A]traitIndexedSeq[T]classAnyAccumulator[A]classDoubleAccumulatorclassIntAccumulatorclassLongAccumulatorclassAbstractSeq[A]traitIndexedSeq[A]traitLinearSeq[A]Show all
- Self type
- T1=>R
Members list
Value members
Abstract methods
Apply the body of this function to the argument.
Apply the body of this function to the argument.
Attributes
- Returns
the result of function application.
- Source
- Function1.scala
Concrete methods
Composes two instances ofFunction1 in a newFunction1, with this function applied first.
Composes two instances ofFunction1 in a newFunction1, with this function applied first.
Type parameters
- A
the result type of function
g
Value parameters
- g
a function R => A
Attributes
- Returns
a new function
fsuch thatf(x) == g(apply(x))- Source
- Function1.scala
Composes two instances ofFunction1 in a newFunction1, with this function applied last.
Composes two instances ofFunction1 in a newFunction1, with this function applied last.
Type parameters
- A
the type to which function
gcan be applied
Value parameters
- g
a function A => T1
Attributes
- Returns
a new function
fsuch thatf(x) == apply(g(x))- Source
- Function1.scala
Returns a string representation of the object.
Returns a string representation of the object.
The default representation is platform dependent.
Attributes
- Returns
a string representation of the object.
- Definition Classes
- Source
- Function1.scala
Converts an optional function to a partial function.
Converts an optional function to a partial function.
Attributes
- Example
UnlikeFunction.unlift, thisUnliftOps.unlift method can be used in extractors.
val of: Int => Option[String] = { i => if (i == 2) { Some("matched by an optional function") } else { None }}util.Random.nextInt(4) match { case of.unlift(m) => // Convert an optional function to a pattern println(m) case _ => println("Not matched")}- Source
- Function1.scala