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Run results for:
Array.prototype.concat vs spread operator vs flat v2
Compare the new ES6 spread operator with the traditional concat() method
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<iframe src="https://measurethat.net/Embed?id=568505" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36
Browser:
Chrome 128
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
spread operator
18.0M/s
Array.prototype.concat
5.2M/s
Array.prototype.flat
2.5M/s
View exact numbers
Test name
Executions per second
✓
spread operator
18,011,860 Ops/sec
Array.prototype.concat
5,215,154 Ops/sec
Array.prototype.flat
2,518,167 Ops/sec
Tests:
Array.prototype.concat
var params = [ "hello", true, 7, ['hey', ['there'], 'dude']]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7, ['hey', ['there'], 'dude']]; var other = [ 1, 2, ...params ]
Array.prototype.flat
var params = [ "hello", true, 7, ['hey', ['there'], 'dude']]; var other = [1, 2, params].flat()