package com.home;

import java.util.*;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.stream.Collectors;

public class javaBiFunction {
    public static void main(String[] args) {
        // takes two Integers and return an Integer
        BiFunction<Integer, Integer, Integer> func = (x1, x2) -> x1 + x2;

        Integer result = func.apply(2, 3);

        System.out.println(result); // 5

        // take two Integers and return an Double
        BiFunction<Integer, Integer, Double> func2 = (x1, x2) -> Math.pow(x1, x2);

        Double result2 = func2.apply(2, 4);

        System.out.println(result2);    // 16.0

        // take two Integers and return a List<Integer>
        BiFunction<Integer, Integer, List<Integer>> func3 = (x1, x2) -> Arrays.asList(x1 + x2);

        List<Integer> result3 = func3.apply(2, 3);

        System.out.println(result3);

        // Math.pow(a1, a2) returns Double
        BiFunction<Integer, Integer, Double> func1 = (a1, a2) -> Math.pow(a1, a2);

        // takes Double, returns String
        Function<Double, String> func2s = (input) -> "Result : " + String.valueOf(input);

        String results = func1.andThen(func2s).apply(2, 4);

        System.out.println(results);
    }
}