Run results for: Object cloning with Lodash clone vs cloneDeep vs merge vs ES6 object spread vs ES6 Object.assign vs JSON.parse(JSON.stringify())

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

ES6 spread

19.9M/s

ES6 Object.assign

6.8M/s

Lodash clone

3.4M/s

JSON.parse(JSON.stringify())

1.0M/s

Lodash cloneDeep

491K/s

Lodash merge

355K/s

View exact numbers

Test name	Executions per second
✓ ES6 spread	19,928,436 Ops/sec
ES6 Object.assign	6,816,626 Ops/sec
Lodash clone	3,402,694 Ops/sec
JSON.parse(JSON.stringify())	1,028,606 Ops/sec
Lodash cloneDeep	490,962 Ops/sec
Lodash merge	355,188 Ops/sec

HTML Preparation code:

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

Script Preparation code:

var o = {
 a: {
   b: 1,
   c: 2,
   d: 3,
   j: {
     k: [1,2,3],
     l: [4,5,6]
   },
 },
 e: [1,2,3,4,5,6],
 f: 1,
 g: {
   h: 1,
 }
}

Tests:

Lodash clone
const a = _.clone(o)
Lodash cloneDeep
const a = _.cloneDeep(o)
Lodash merge
const a = _.merge({}, o)
ES6 spread
const a = { ...o }
ES6 Object.assign
const a = Object.assign({}, o)
JSON.parse(JSON.stringify())
const a = JSON.parse(JSON.stringify(o))