Interface Fn0<A>

Type Parameters:

A - the result type

All Superinterfaces:

Applicative<A, Fn1<Unit,?>>, Cartesian<Unit,A,Fn1<?,?>>, Cocartesian<Unit,A,Fn1<?,?>>, Contravariant<Unit, Profunctor<?,A,Fn1<?,?>>>, Fn1<Unit,A>, Functor<A, Fn1<Unit,?>>, Monad<A, Fn1<Unit,?>>, MonadReader<Unit, A, Fn1<Unit,?>>, MonadRec<A, Fn1<Unit,?>>, MonadWriter<Unit, A, Fn1<Unit,?>>, Profunctor<Unit,A,Fn1<?,?>>

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 interface Fn0<A>
extends Fn1<Unit,A>

A function taking "no arguments", implemented as an Fn1<Unit, A>.

See Also:

• Fn1
• Callable

Method Summary

Modifier and Type	Method	Description
default A	apply()	Convenience method for applying this Fn0 without providing an explicit Unit.
A	checkedApply()
default A	checkedApply(Unit unit)	Invoke this function with the given argument, potentially throwing any Throwable.
default <B> Fn0<B>	diMapR(Fn1<? super A, ? extends B> fn)	Covariantly map over the return value of this function, producing a function that takes the same argument, and produces the new result type.
default <B> Fn0<B>	discardL(Applicative<B, Fn1<Unit,?>> appB)	Sequence both this Applicative and appB, discarding this Applicative's result and returning appB.
default <B> Fn0<A>	discardR(Applicative<B, Fn1<Unit,?>> appB)	Sequence both this Applicative and appB, discarding appB's result and returning this Applicative.
default <B> Fn0<B>	flatMap(Fn1<? super A, ? extends Monad<B, Fn1<Unit,?>>> f)	Chain dependent computations that may continue or short-circuit based on previous results.
default <B> Fn0<B>	fmap(Fn1<? super A, ? extends B> f)	Left-to-right composition.
static <A> Fn0<A>	fn0(Fn0<A> fn)	Static factory method for coercing a lambda to an Fn0.
static <A> Fn0<A>	fn0(Fn1<Unit,A> fn)	Static factory method for adapting an Fn1<Unit, A> to an Fn0<A>.
static <A> Fn0<A>	fromCallable(Callable<A> callable)	Convenience method for converting a Callable to an Fn0.
static <A> Fn0<A>	fromSupplier(Supplier<A> supplier)	Convenience method for converting a Supplier to an Fn0.
default <B> Fn0<B>	pure(B b)	Lift the value b into this applicative functor.
default Callable<A>	toCallable()	Convert this Fn0 to a java Callable
default Supplier<A>	toSupplier()	Convert this Fn0 to a java Supplier
default <B> Fn0<B>	zip(Fn2<Unit,A,B> appFn)
default <B> Fn0<B>	zip(Applicative<Fn1<? super A, ? extends B>, Fn1<Unit,?>> appFn)	Given another instance of this applicative over a mapping function, "zip" the two instances together using whatever application semantics the current applicative supports.

Methods inherited from interface Fn1

andThen, apply, carry, cartesian, censor, choose, cocartesian, compose, contraMap, diMap, diMapL, lazyZip, listens, local, self, thunk, toFunction, trampolineM, widen

Methods inherited from interface Functor

coerce

Method Details

checkedApply

A checkedApply()
        throws Throwable

Throws:

Throwable

apply

default A apply()

Convenience method for applying this Fn0 without providing an explicit Unit.

Returns:

the result

toSupplier

default Supplier<A> toSupplier()

Convert this Fn0 to a java Supplier

Returns:

the Supplier

toCallable

default Callable<A> toCallable()

Convert this Fn0 to a java Callable

Returns:

the Callable

checkedApply

default A checkedApply(Unit unit)
                throws Throwable

Invoke this function with the given argument, potentially throwing any Throwable.

Specified by:

checkedApply in interface Fn1<Unit,A>

Parameters:

unit - the argument

Returns:

the result of the function application

Throws:

Throwable - anything possibly thrown by the function

flatMap

default <B> Fn0<B> flatMap(Fn1<? super A, ? extends Monad<B, Fn1<Unit,?>>> f)

Description copied from interface: Fn1

Chain dependent computations that may continue or short-circuit based on previous results.

Specified by:

flatMap in interface Fn1<Unit,A>

Specified by:

flatMap in interface Monad<A, Fn1<Unit,?>>

Specified by:

flatMap in interface MonadReader<Unit, A, Fn1<Unit,?>>

Specified by:

flatMap in interface MonadRec<A, Fn1<Unit,?>>

Specified by:

flatMap in interface MonadWriter<Unit, A, Fn1<Unit,?>>

Type Parameters:

B - the resulting monad parameter type

Parameters:

f - the dependent computation over A

Returns:

the new monad instance

fmap

default <B> Fn0<B> fmap(Fn1<? super A, ? extends B> f)

Description copied from interface: Fn1

Left-to-right composition.

Specified by:

fmap in interface Applicative<A, Fn1<Unit,?>>

Specified by:

fmap in interface Fn1<Unit,A>

Specified by:

fmap in interface Functor<A, Fn1<Unit,?>>

Specified by:

fmap in interface Monad<A, Fn1<Unit,?>>

Specified by:

fmap in interface MonadReader<Unit, A, Fn1<Unit,?>>

Specified by:

fmap in interface MonadRec<A, Fn1<Unit,?>>

Specified by:

fmap in interface MonadWriter<Unit, A, Fn1<Unit,?>>

Type Parameters:

B - the return type of the next function to invoke

Parameters:

f - the function to invoke with this function's return value

Returns:

a function representing the composition of this function and f

pure

default <B> Fn0<B> pure(B b)

Description copied from interface: Fn1

Lift the value b into this applicative functor.

Specified by:

pure in interface Applicative<A, Fn1<Unit,?>>

Specified by:

pure in interface Fn1<Unit,A>

Specified by:

pure in interface Monad<A, Fn1<Unit,?>>

Specified by:

pure in interface MonadReader<Unit, A, Fn1<Unit,?>>

Specified by:

pure in interface MonadRec<A, Fn1<Unit,?>>

Specified by:

pure in interface MonadWriter<Unit, A, Fn1<Unit,?>>

Type Parameters:

B - the type of the returned applicative's parameter

Parameters:

b - the value

Returns:

an instance of this applicative over b

zip

default <B> Fn0<B> zip(Applicative<Fn1<? super A, ? extends B>, Fn1<Unit,?>> appFn)

Description copied from interface: Fn1

Given another instance of this applicative over a mapping function, "zip" the two instances together using whatever application semantics the current applicative supports.

Specified by:

zip in interface Applicative<A, Fn1<Unit,?>>

Specified by:

zip in interface Fn1<Unit,A>

Specified by:

zip in interface Monad<A, Fn1<Unit,?>>

Specified by:

zip in interface MonadReader<Unit, A, Fn1<Unit,?>>

Specified by:

zip in interface MonadRec<A, Fn1<Unit,?>>

Specified by:

zip in interface MonadWriter<Unit, A, Fn1<Unit,?>>

Type Parameters:

B - the resulting applicative parameter type

Parameters:

appFn - the other applicative instance

Returns:

the mapped applicative

zip

default <B> Fn0<B> zip(Fn2<Unit,A,B> appFn)

Description copied from interface: Fn1

Specified by:

zip in interface Fn1<Unit,A>

discardL

default <B> Fn0<B> discardL(Applicative<B, Fn1<Unit,?>> appB)

Description copied from interface: Fn1

Sequence both this Applicative and appB, discarding this Applicative's result and returning appB. This is generally useful for sequentially performing side-effects.

Specified by:

discardL in interface Applicative<A, Fn1<Unit,?>>

Specified by:

discardL in interface Fn1<Unit,A>

Specified by:

discardL in interface Monad<A, Fn1<Unit,?>>

Specified by:

discardL in interface MonadReader<Unit, A, Fn1<Unit,?>>

Specified by:

discardL in interface MonadRec<A, Fn1<Unit,?>>

Specified by:

discardL in interface MonadWriter<Unit, A, Fn1<Unit,?>>

Type Parameters:

B - the type of the returned Applicative's parameter

Parameters:

appB - the other Applicative

Returns:

appB

discardR

default <B> Fn0<A> discardR(Applicative<B, Fn1<Unit,?>> appB)

Description copied from interface: Fn1

Sequence both this Applicative and appB, discarding appB's result and returning this Applicative. This is generally useful for sequentially performing side-effects.

Specified by:

discardR in interface Applicative<A, Fn1<Unit,?>>

Specified by:

discardR in interface Fn1<Unit,A>

Specified by:

discardR in interface Monad<A, Fn1<Unit,?>>

Specified by:

discardR in interface MonadReader<Unit, A, Fn1<Unit,?>>

Specified by:

discardR in interface MonadRec<A, Fn1<Unit,?>>

Specified by:

discardR in interface MonadWriter<Unit, A, Fn1<Unit,?>>

Type Parameters:

B - the type of appB's parameter

Parameters:

appB - the other Applicative

Returns:

this Applicative

diMapR

default <B> Fn0<B> diMapR(Fn1<? super A, ? extends B> fn)

Description copied from interface: Fn1

Covariantly map over the return value of this function, producing a function that takes the same argument, and produces the new result type.

Specified by:

diMapR in interface Cartesian<Unit,A,Fn1<?,?>>

Specified by:

diMapR in interface Cocartesian<Unit,A,Fn1<?,?>>

Specified by:

diMapR in interface Fn1<Unit,A>

Specified by:

diMapR in interface Profunctor<Unit,A,Fn1<?,?>>

Type Parameters:

B - the new result type

Parameters:

fn - the covariant result mapping function

Returns:

an Fn1<A, C>

fromSupplier

static <A> Fn0<A> fromSupplier(Supplier<A> supplier)

Convenience method for converting a Supplier to an Fn0.

Type Parameters:

A - the output type

Parameters:

supplier - the supplier

Returns:

the Fn0

fromCallable

static <A> Fn0<A> fromCallable(Callable<A> callable)

Convenience method for converting a Callable to an Fn0.

Type Parameters:

A - the output type

Parameters:

callable - the callable

Returns:

the Fn0

fn0

static <A> Fn0<A> fn0(Fn0<A> fn)

Static factory method for coercing a lambda to an Fn0.

Type Parameters:

A - the output type

Parameters:

fn - the lambda to coerce

Returns:

the Fn0

fn0

static <A> Fn0<A> fn0(Fn1<Unit,A> fn)

Static factory method for adapting an Fn1<Unit, A> to an Fn0<A>.

Type Parameters:

A - the output type

Parameters:

fn - the Fn1

Returns:

the Fn0