Run results for: lodash merge vs deepmerge vs lodash/fp merge

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser: Chrome 125

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

object.assign

3.3M/s

lodash merge

642K/s

lodash/fp merge

520K/s

View exact numbers

Test name	Executions per second
✓ object.assign	3,327,077 Ops/sec
lodash merge	641,678 Ops/sec
lodash/fp merge	520,416 Ops/sec

HTML Preparation code:


<script src='https://cdn.jsdelivr.net/g/lodash@4(lodash.min.js+lodash.fp.min.js)'></script>
<script src='https://unpkg.com/deepmerge@3.2.0/dist/umd.js'></script>

Script Preparation code:

var fp = _.noConflict();

Tests:

lodash merge
var a = { a: 'oh', b: 'my', c: { a: 'a', b: { c: 'c' } } }; var b = { c: { b: { d: 'a' }, c: { d: 'd' } } }; var c = _.merge({}, a, b);
object.assign
var a = { a: 'oh', b: 'my', c: { a: 'a', b: { c: 'c' } } }; var b = { c: { b: { d: 'a' }, c: { d: 'd' } } }; var c = deepmerge({}, a, b);
lodash/fp merge
var a = { a: 'oh', b: 'my', c: { a: 'a', b: { c: 'c' } } }; var b = { c: { b: { d: 'a' }, c: { d: 'd' } } }; var c = fp.merge(b, a);