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Run results for:
reduce.concat() vs flat()
Compare the new ES6 spread operator with the traditional concat() method
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<iframe src="https://measurethat.net/Embed?id=609087" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:139.0) Gecko/20100101 Firefox/139.0
Browser:
Firefox 139
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
one year ago
Array.prototype.flat
20.2M/s
reduce + Array.prototype.concat
18.4M/s
View exact numbers
Test name
Executions per second
✓
Array.prototype.flat
20,168,860 Ops/sec
reduce + Array.prototype.concat
18,413,828 Ops/sec
Tests:
reduce + Array.prototype.concat
var params = [[ 1, 2 ], [ "hello", true, 7 ]]; var other = params.reduce((acc, val) => acc.concat(val), []);
Array.prototype.flat
var params = [[1, 2, params], [ "hello", true, 7 ]]; var other = params.flat();