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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36 Edg/135.0.0.0

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

object.assign

15.4M/s

spread

13.9M/s

lodash merge

2.3M/s

View exact numbers

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: 'my', deep: {a:'a',b:'b'} }; var b = { c: 'goddess' , deep: {c: 'c', b: 'b2'}}; var c = _.merge(a, b);
object.assign
var a = { a: 'oh', b: 'my', deep: {a:'a',b:'b'} }; var b = { c: 'goddess' , deep: {c: 'c', b: 'b2'}}; var c = Object.assign(a, b, {deep: Object.assign(a.deep, b.deep)});
spread
var a = { a: 'oh', b: 'my', deep: {a:'a',b:'b'} }; var b = { c: 'goddess' , deep: {c: 'c', b: 'b2'}}; var c = { ...a, ...b, deep:{...a.deep, ...b.deep} };