EJ: C4 P4 created by oliverjam - https://repl.it/ESYb/2

EJ: C4 P4.js

// function deepEqual(a, b) {
// 	if ((typeof a === 'object' && typeof a !== null) && (typeof b === 'object' && typeof b !== null)) {
// 		if (Object.getOwnPropertyNames(a).length === Object.getOwnPropertyNames(b).length) {
// 			for (const propA in a) {
// 				console.log('First loop:' + a[propA]);
// 				for (const propB in b) {
// 					// return deepEqual(propA, propB);
					
// 					console.log('Second loop:' + b[propB]);
// 				}
// 			}
// 		} else {
// 			return false;
// 		}
// 	} else {
// 		return a === b;
// 	}
// }

function deepEqual(a, b) {
  if (a === b) return true;
  if (a === null || typeof a != "object" || b === null || typeof b != "object") return false;
  let propsInA = 0
  let propsInB = 0;
  for (let prop in a) propsInA += 1;
  for (let prop in b) {
    propsInB += 1;
    if (!(prop in a) || !deepEqual(a[prop], b[prop]))
      return false;
  }
  return propsInA == propsInB;
}

var obj = {here: {is: "an"}, object: 2};
console.log(deepEqual(obj, obj));
// // → true
console.log(deepEqual(obj, {here: 1, object: 2}));
// // → false
console.log(deepEqual(obj, {here: {is: "an"}, object: 2}));
// // → true