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Run results for:
JavaScript String Concatenation: String Append vs String.prototype.concat vs Array.prototype.join
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=623964" 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/144.0.0.0 Safari/537.36
Browser:
Chrome 144
Operating system:
Windows
Device Platform:
Desktop
Date tested:
6 months ago
String Append
396K/s
String.prototype.concat
356K/s
Array.prototype.join
127K/s
View exact numbers
Test name
Executions per second
✓
String Append
396,471 Ops/sec
String.prototype.concat
355,724 Ops/sec
Array.prototype.join
127,125 Ops/sec
Script Preparation code:
const array = []; for (let i = 0; i < 1024; i++) array.push(i.toString());
Tests:
String Append
let str = ""; for (const i of array) str += i;
String.prototype.concat
const str = "".concat(...array);
Array.prototype.join
const str = array.join("");