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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=486870" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; rv:120.0) Gecko/20100101 Firefox/120.0
Browser:
Firefox 120
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
Push
12.3M/s
Array.prototype.concat
1.2M/s
spread operator
718K/s
View exact numbers
Test name
Executions per second
✓
Push
12,336,349 Ops/sec
Array.prototype.concat
1,211,702 Ops/sec
spread operator
718,070 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); };