Run results for: lodash merge vs object.assign vs spread with arrays

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) GSA/315.0.630091404 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.4

Device Platform: Mobile

Date tested: 2 years ago

object.assign

13.7M/s

spread

12.9M/s

lodash merge

1.9M/s

View exact numbers

Test name	Executions per second
✓ object.assign	13,691,325 Ops/sec
spread	12,944,097 Ops/sec
lodash merge	1,871,053 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Tests:

lodash merge
var a = { a: 'oh', b: [1, 2, 3] }; var b = { b: [2, 3, 4] }; var c = _.merge(a, b);
object.assign
var a = { a: 'oh', b: [1, 2, 3] }; var b = { b: [2, 3, 4] }; var c = Object.assign(a, b);
spread
var a = { a: 'oh', b: [1, 2, 3] }; var b = { b: [2, 3, 4] }; var c = { ...a, ...b };