org.organicdesign.fp.function

Interface Function2<A,B,R>

All Superinterfaces:

BiFunction<A,B,R>

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 Function2<A,B,R>
extends BiFunction<A,B,R>

This is like Java 8's java.util.function.BiFunction, but retrofitted to turn checked exceptions into unchecked ones.

Method Summary

Modifier and Type	Method and Description
default R	apply(A a, B b) The class that takes a consumer as an argument uses this convenience method so that it doesn't have to worry about checked exceptions either.
R	applyEx(A a, B b) Implement this one method and you don't have to worry about checked exceptions.
static <A,B,Z> Function2<A,B,Z>	memoize(Function2<A,B,Z> f) Use only on pure functions with no side effects.

Methods inherited from interface java.util.function.BiFunction

andThen

Method Detail

applyEx

R applyEx(A a,
          B b)
   throws Exception

Implement this one method and you don't have to worry about checked exceptions.

Throws:

Exception

apply

default R apply(A a,
                B b)

The class that takes a consumer as an argument uses this convenience method so that it doesn't have to worry about checked exceptions either.

Specified by:

apply in interface BiFunction<A,B,R>

memoize

static <A,B,Z> Function2<A,B,Z> memoize(Function2<A,B,Z> f)

Use only on pure functions with no side effects. Wrap an expensive function with this and for each input value, the output will only be computed once. Subsequent calls with the same input will return identical output very quickly. Please note that the parameters to f need to implement equals() and hashCode() correctly for this to work correctly and quickly.