Run results for: Javascript: Array concat vs spread operator vs push speed test

Run details:

User agent: Mozilla/5.0 (Linux; Android 12; SAMSUNG SM-G991B) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/16.0 Chrome/92.0.4515.166 Mobile Safari/537.36

Browser: Chrome Mobile 92

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Array.prototype.concat	659258.8 Ops/sec
spread operator	2685200.2 Ops/sec
Push	21960840.0 Ops/sec

Tests:

Array.prototype.concat
var newValue = { foo: 'baz', bar: 'biz' }; var existingArray = []; var i = 0; while(i++ < 10) { existingArray.concat([newValue]); };
spread operator
var newValue = { foo: 'baz', bar: 'biz' }; var existingArray = []; var i = 0; while(i++ < 10) { existingArray = [...existingArray, newValue]; };
Push
var newValue = { foo: 'baz', bar: 'biz' }; var existingArray = []; var i = 0; while(i++ < 10) { existingArray.push(newValue); };

Run results for: Javascript: Array concat vs spread operator vs push speed test

Compare the new ES6 spread operator with the traditional concat() method and push. (by j3)

Array.prototype.concat

spread operator

Push