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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=613473" 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/138.0.0.0 Safari/537.36
Browser:
Chrome 138
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
reduce + Array.prototype.concat
11.7M/s
Array.prototype.flat
6.2M/s
View exact numbers
Test name
Executions per second
✓
reduce + Array.prototype.concat
11,719,851 Ops/sec
Array.prototype.flat
6,180,399 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();