Run results for: Lodash isEqual vs shallowEqual test

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36

Browser: Chrome 112

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
_.isEqual Level 1	1122188.0 Ops/sec
JSON.stringify Level 1	633716.8 Ops/sec
_.isEqual Level 2	692744.5 Ops/sec
JSON.stringify Level 2	634989.9 Ops/sec
_.isEqual Level 3	525239.0 Ops/sec
JSON.stringify Level 3	646595.5 Ops/sec
shallowEqual Level 1	1310120.0 Ops/sec
shallowEqual Level 2	1026651.0 Ops/sec
shallowEqual Level 3	1025201.0 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/lodash@4.17.4/lodash.min.js"></script>

Script Preparation code:

function is(x, y) {
	if (x === y) {
		return x !== 0 || y !== 0 || 1 / x === 1 / y;
	}
	return x !== x && y !== y;
}

function shallowEqual(objA, objB) {
	if (is(objA, objB)) return true;

	if (typeof objA !== 'object' || objA === null || typeof objB !== 'object' || objB === null) {
		return false;
	}

	const keysA = Object.keys(objA);
	const keysB = Object.keys(objB);

	if (keysA.length !== keysB.length) return false;

	for (let i = 0; i < keysA.length; i++) {
		if (!Object.prototype.hasOwnProperty.call(objB, keysA[i]) || !is(objA[keysA[i]], objB[keysA[i]])) {
			return false;
		}
	}

	return true;
}

// 1 level deep
window.foo1 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar1 = { a: 1, b: 3, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };

// 2 levels deep
window.foo2 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar2 = { a: 1, b: 2, c: { a: 1, b: 3, c: { a: 1, b: 2 } } };

// 3 levels deep
window.foo3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 2 } } };
window.bar3 = { a: 1, b: 2, c: { a: 1, b: 2, c: { a: 1, b: 4 } } };

Tests:

_.isEqual Level 1
_.isEqual(window.foo1, window.bar1)
JSON.stringify Level 1
JSON.stringify(window.foo1) === JSON.stringify(window.bar1);
_.isEqual Level 2
_.isEqual(window.foo2, window.bar2)
JSON.stringify Level 2
JSON.stringify(window.foo2) === JSON.stringify(window.bar2);
_.isEqual Level 3
_.isEqual(window.foo3, window.bar3)
JSON.stringify Level 3
JSON.stringify(window.foo3) === JSON.stringify(window.bar3);
shallowEqual Level 1
shallowEqual(window.foo1, window.bar1)
shallowEqual Level 2
shallowEqual(window.foo2, window.bar2)
shallowEqual Level 3
shallowEqual(window.foo3, window.bar3)

Run results for: Lodash isEqual vs shallowEqual test

Test on isEqual performance

_.isEqual Level 1

JSON.stringify Level 1

_.isEqual Level 2

JSON.stringify Level 2

_.isEqual Level 3

JSON.stringify Level 3

shallowEqual Level 1

shallowEqual Level 2

shallowEqual Level 3