Currying

[javatlacati]

I's a functional programming design pattern. As far as I understand you call a function with less parameters than usual and it can be used to defer processing when it has many steps involved.

UML example

@startuml
'https://plantuml.com/class-diagram

interface BiFunction <ParamType1, ParamType2, ResultType>{
}

interface Curried<ParamType1, ParamType2 extends Simple> {
  +ParamType2 apply(final ParamType1 a);
}

interface Simple<ParamType1, ParamType2, ResultType> extends BiFunction {
  +ResultType apply(final ParamType1 a, final ParamType2 b);
}

@enduml

With the curried version you can do stuff like:

   System.out.println(curriedAdd.apply(4).apply(5));

    Function1<Integer, Integer> adder5 = curriedAdd.apply(5);
    //some complicate and time consuming process here
    System.out.println(adder5.apply(4));
    System.out.println(adder5.apply(6));

[iluwatar]

There is a concrete example about currying in Java on Baeldung's website: https://www.baeldung.com/java-currying

[januslinhc]

hi @iluwatar , can I work on this issue for Hacktoberfest?

[iluwatar]

Sure @januslinhc, it's now assigned to you

[hkattt]

Hey @iluwatar, could I work on this issue?

[iluwatar]

All right @hkattt, you're free to proceed

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[iluwatar]

@hkattt is still working on this