Functional Programming – Returning a Function
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As a High Order function can return a function but how to implement using Java 8. Java 8 has provided Function interface which can accept a lambda expression. A high order function can return a lamdba expression and thus this high order function can be used to create any number of functions. See the example below −
import java.util.function.Function; public class FunctionTester { public static void main(String[] args) { Function<Integer, Integer> addOne = adder(1); Function<Integer, Integer> addTwo = adder(2); Function<Integer, Integer> addThree = adder(3); //result = 4 + 1 = 5 Integer result = addOne.apply(4); System.out.println(result); //result = 4 + 2 = 6 result = addTwo.apply(4); System.out.println(result); //result = 4 + 3 = 7 result = addThree.apply(4); System.out.println(result); } //adder - High Order Function //returns a function as lambda expression static Function<Integer, Integer> adder(Integer x){ return y -> y + x; } }
Output
5 6 7
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