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Run results for:
Array.prototype.concat vs spread operator on large array
Compare the new ES6 spread operator with the traditional concat() method
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<iframe src="https://measurethat.net/Embed?id=599317" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:137.0) Gecko/20100101 Firefox/137.0
Browser:
Firefox 137
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
one year ago
Array.prototype.concat
148K/s
spread operator
17K/s
View exact numbers
Test name
Executions per second
✓
Array.prototype.concat
147,926 Ops/sec
spread operator
17,281 Ops/sec
Script Preparation code:
var array = new Array(10000).fill(1) var toConcat = new Array(5000).fill(2)
Tests:
Array.prototype.concat
var other = array.concat(toConcat);
spread operator
var other = [ ...array, ...toConcat ]