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Run results for:
Array.prototype.concat vs spread operator vs flat
Compare the new ES6 spread operator with the traditional concat() method
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<iframe src="https://measurethat.net/Embed?id=599455" 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/135.0.0.0 Safari/537.36
Browser:
Chrome 135
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
spread operator
61.9M/s
Array.prototype.concat
18.6M/s
Array.prototype.flat
8.8M/s
View exact numbers
Test name
Executions per second
✓
spread operator
61,859,328 Ops/sec
Array.prototype.concat
18,551,332 Ops/sec
Array.prototype.flat
8,843,554 Ops/sec
Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Array.prototype.flat
var params = [ "hello", true, 7 ]; var other = [1, 2, params].flat()