Run results for: Object.assign vs. JSON String/Parse

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; SM-G986U) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.116 Mobile Safari/537.36 EdgA/46.06.4.5161

Browser: Chrome Mobile 77

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Spread operator	1337895000.0 Ops/sec
JSON Parse	1341485000.0 Ops/sec
Object.assign	1330544000.0 Ops/sec

Tests:

Spread operator
var n = {foo: 'bar', hello: [{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'}]}; while(n.length < 1000) { n = [...n]; }
JSON Parse
var n = {foo: 'bar', hello: [{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'}]}; while(n.length < 1000) { n = JSON.parse(JSON.stringify(n)) }
Object.assign
var n = {foo: 'bar', hello: [{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'},{hello: 'world', foo: 'bar'}]}; while(n.length < 1000) { n = Object.assign({}, n); }

Run results for: Object.assign vs. JSON String/Parse

Creating a "new" object reference every time

Spread operator

JSON Parse

Object.assign