Package com.github.tonivade.purefun.core

Interface Function1<A,R>

Type Parameters:

A - type of function parameter

R - type of return value

All Superinterfaces:

Function1Of<A,R>, Kind<Function1<A,?>,R>, Recoverable

All Known Subinterfaces:

Operator1<T>

All Known Implementing Classes:

MemoizedFunction

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public non-sealed interface Function1<A,R>
extends Function1Of<A,R>, Recoverable

This interface represents a function with a single parameter. Similar to Function.

The function can throws checked exceptions, but calling apply() method, the exception is sneaky thrown. So, it can be used as a higher order function in Stream or Optional API.

Method Summary

Modifier and Type	Method	Description
default <B> Function1<A,B>	andThen(Function1<? super R,? extends B> after)
default R	apply(A value)
default <B> Function1<B,R>	compose(Function1<? super B,? extends A> before)
static <A, T> Function1<A,T>	cons(Producer<? extends T> cons)
static <A, T> Function1<A,T>	cons(T cons)
default <B, Z> Function1<B,Z>	dimap(Function1<? super B,? extends A> before, Function1<? super R,? extends Z> after)
static <X extends Throwable, A, T> Function1<A,T>	fail(Producer<? extends X> supplier)
default <B> Function1<A,B>	flatMap(Function1<? super R,? extends Function1<? super A,? extends B>> after)
static <A> Function1<A,A>	identity()
default Function1<A,Either<Throwable,R>>	liftEither()
default Function1<A,Future<R>>	liftFuture()
default Function1<A,Id<R>>	liftId()
default <L> Function1<A,Either<R,L>>	liftLeft()
default Function1<A,Option<R>>	liftOption()
default Function1<A,Optional<R>>	liftOptional()
default <L> Function1<A,Either<L,R>>	liftRight()
default Function1<A,Try<R>>	liftTry()
default Function1<A,R>	memoized()
static <A, R> Function1<A,R>	of(Function1<? super A,? extends R> reference)
default PartialFunction1<A,R>	partial(Matcher1<? super A> isDefined)
R	run(A value)
default Function1<A,Sequence<R>>	sequence()
default Function1<A,Stream<R>>	stream()

Methods inherited from interface com.github.tonivade.purefun.Kind

fix, kind

Methods inherited from interface com.github.tonivade.purefun.core.Recoverable

sneakyThrow

Method Details

apply

default R apply(A value)

run

R run(A value)
throws Throwable

Throws:

Throwable

andThen

default <B> Function1<A,B> andThen(Function1<? super R,? extends B> after)

compose

default <B> Function1<B,R> compose(Function1<? super B,? extends A> before)

dimap

default <B,
Z> Function1<B,Z> dimap(Function1<? super B,? extends A> before,
 Function1<? super R,? extends Z> after)

flatMap

default <B> Function1<A,B> flatMap(Function1<? super R,? extends Function1<? super A,? extends B>> after)

liftOptional

default Function1<A,Optional<R>> liftOptional()

liftOption

default Function1<A,Option<R>> liftOption()

liftTry

default Function1<A,Try<R>> liftTry()

liftId

default Function1<A,Id<R>> liftId()

liftFuture

default Function1<A,Future<R>> liftFuture()

liftEither

default Function1<A,Either<Throwable,R>> liftEither()

liftRight

default <L> Function1<A,Either<L,R>> liftRight()

liftLeft

default <L> Function1<A,Either<R,L>> liftLeft()

sequence

default Function1<A,Sequence<R>> sequence()

stream

default Function1<A,Stream<R>> stream()

memoized

default Function1<A,R> memoized()

partial

default PartialFunction1<A,R> partial(Matcher1<? super A> isDefined)

identity

static <A> Function1<A,A> identity()

cons

static <A,
T> Function1<A,T> cons(T cons)

cons

static <A,
T> Function1<A,T> cons(Producer<? extends T> cons)

fail

static <X extends Throwable,
A,
T> Function1<A,T> fail(Producer<? extends X> supplier)

of

static <A,
R> Function1<A,R> of(Function1<? super A,? extends R> reference)