package common;

import java.util.function.Function;
import java.util.function.Predicate;

public class Predicates {

	/**
	* <pre>
	*Stream.of(new Point(1, 2), new Point(2, 3))
	*
	*  // write
	*  .filter(equals(1D, Point::getX))
	*
	*  // instead of
	*  .filter(p -> new Double(1).equals(p.getX()) )
	* </pre>
	*/
	public static <T, U> Predicate<T> equals(final U expected, Function<T, U> mapping) {
		return (T it) -> expected.equals(mapping.apply(it));
	}

}