ques-6-curry.java

/*
 * QUESTION: curry(triFunction) — convert a 3-argument function into nested
 * single-argument Function objects: Function<A,Function<B,Function<C,R>>>.
 * Used by pro-1-java-utils for building small reusable pricing helpers.
 *
 * Input:  curry(TaxCalc::apply).apply(100).apply(0.18).apply("INR")
 * Output: computed tax value for that curried call chain
 */

import java.util.function.Function;

class Curry {
  interface TriFunction<A, B, C, R> {
    R apply(A a, B b, C c);
  }

  static <A, B, C, R> Function<A, Function<B, Function<C, R>>> curry(TriFunction<A, B, C, R> fn) {
    throw new UnsupportedOperationException("TODO");
  }
}

// --- TEST ---
// TriFunction<Integer, Integer, Integer, Integer> add3 = (a, b, c) -> a + b + c;
// System.out.println(Curry.curry(add3).apply(1).apply(2).apply(3)); // 6