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JavaScript String Concatenation: String Append vs String.prototype.concat vs Array.prototype.join
(version: 1)
Comparing performance of:
String Append vs String.prototype.concat vs Array.prototype.join
Created:
3 months ago
by:
Registered User
Jump to the latest result
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("");
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
String Append
String.prototype.concat
Array.prototype.join
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
20 days ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/147.0.0.0 Safari/537.36
Browser/OS:
Chrome 147 on Windows
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=627707" width="100%" height="500px"></iframe>
Test name
Executions per second
String Append
396177.5 Ops/sec
String.prototype.concat
349019.9 Ops/sec
Array.prototype.join
136254.2 Ops/sec
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