Object.is - Poly fill - YDKJS Kyle Simpson 🙇‍♂️

ObjectIs.js

// TODO: define polyfill for `Object.is(..)`
// my solution 😛

if (!Object.is || true) {
  Object.is = function ObjectIs(p1, p2) {
    if (Number.isNaN(p1) && Number.isNaN(p2)) {
      return true;
    } else if (2 / p1 === -Infinity || 2 / p2 === -Infinity) {
      if (2 / p1 === -Infinity && 2 / p2 === -Infinity) {
        return true;
      }
      return false;
    } else if (p1 === p2) {
      return true;
    }
    return false;
  };
}

// Kyle's solution 🤯

// if (!Object.is /*|| true*/) {
// 	Object.is = function ObjectIs(x,y) {
// 		var xNegZero = isItNegZero(x);
// 		var yNegZero = isItNegZero(y);

// 		if (xNegZero || yNegZero) {
// 			return xNegZero && yNegZero;
// 		}
// 		else if (isItNaN(x) && isItNaN(y)) {
// 			return true;
// 		}
// 		else if (x === y) {
// 			return true;
// 		}

// 		return false;

// 		// **********

// 		function isItNegZero(x) {
// 			return x === 0 && (1 / x) === -Infinity;
// 		}

// 		function isItNaN(x) {
// 			return x !== x;
// 		}
// 	};
// }

// tests:
console.log(Object.is(42, 42) === true);
console.log(Object.is("foo", "foo") === true);
console.log(Object.is(false, false) === true);
console.log(Object.is(null, null) === true);
console.log(Object.is(undefined, undefined) === true);
console.log(Object.is(NaN, NaN) === true);
console.log(Object.is(-0, -0) === true);
console.log(Object.is(0, 0) === true);

console.log(Object.is(-0, 0) === false);
console.log(Object.is(0, -0) === false);
console.log(Object.is(0, NaN) === false);
console.log(Object.is(NaN, 0) === false);
console.log(Object.is(42, "42") === false);
console.log(Object.is("42", 42) === false);
console.log(Object.is("foo", "bar") === false);
console.log(Object.is(false, true) === false);
console.log(Object.is(null, undefined) === false);
console.log(Object.is(undefined, null) === false);