// functional/CurryingAndPartials.java

// (c)2020 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.function.*;

public class CurryingAndPartials {

// Uncurried:

static String uncurried(String a, String b) {

return a + b;

}

public static void main(String[] args) {

System.err.println(uncurried("Hi ", "Ho"));

// Curried function:

Function<String, Function<String, String>> sum = a -> b -> a + b; // [1]

Function<String, String> hi = sum.apply("Hi "); // [2]

String ho = hi.apply("Ho");

System.err.println(ho);

System.err.println(sum.apply("A ").apply("B"));

// Partial application:

Function<String, String> sumHi = sum.apply("Hup ");

System.err.println(sumHi.apply("Ho"));

System.err.println(sumHi.apply("Hey"));

}

}

/* Output:

Hi Ho

Hi Ho

Hup Ho

Hup Hey

*/