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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=552644" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:129.0) Gecko/20100101 Firefox/129.0
Browser:
Firefox 129
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
spread operator
28.5M/s
Array.prototype.concat
23.5M/s
Array.prototype.flat
20.0M/s
View exact numbers
Test name
Executions per second
✓
spread operator
28,511,998 Ops/sec
Array.prototype.concat
23,528,842 Ops/sec
Array.prototype.flat
19,979,090 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()