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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)
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<iframe src="https://measurethat.net/Embed?id=504558" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
Browser:
Chrome 121
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
Array.prototype.concat
4992055.5 Ops/sec
spread operator
2954117.8 Ops/sec
Push
25485552.0 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); };