import java.util.function.*;
public class ClosureProps {

	public static Predicate<Integer> union(Predicate<Integer> memA, Predicate<Integer> memB) {
		return (n) -> memA.test(n) || memB.test(n);
	}


	// tests

	public static boolean isSmall(Integer n) { return n < 10; }
	public static boolean divBy5(Integer n) { return n % 5 == 0; }


	public static void main(String args[]) {
		Predicate<Integer> mem = union(ClosureProps::isSmall, ClosureProps::divBy5);
		for(int i = 0; i < 21; i++) {
			System.out.println("mem(" + i + ") = " + mem.test(i));
		}
	}

}