// functional/CurryingAndPartials.java
// (c)2017 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) {
 // Curried function:
 Function<String, Function<String, String>> sum =
 a -> b -> a + b; // [1]

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

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

 // Partial application:
 Function<String, String> sumHi =
 sum.apply("Hup ");
 System.out.println(sumHi.apply("Ho"));
 System.out.println(sumHi.apply("Hey"));
 }
}
/* Output:
Hi Ho
Hi Ho
Hup Ho
Hup Hey
*/