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Run results for:
JS Fastest Array Shallow Copy
Testing the results for the fastest approach of shallow copying an array in JavaScript (concat, slice, for loop, and while loop).
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=580305" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
Array.slice
99.3M/s
For loop
17.8M/s
For loop with declared length
17.6M/s
While loop
16.8M/s
Array.concat
14.5M/s
View exact numbers
Test name
Executions per second
✓
Array.slice
99,317,656 Ops/sec
For loop
17,755,298 Ops/sec
For loop with declared length
17,594,042 Ops/sec
While loop
16,758,249 Ops/sec
Array.concat
14,492,913 Ops/sec
Tests:
Array.concat
var a = [ "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello" ]; var b = []; var other = a.concat(b);
Array.slice
var a = [ "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello" ]; var b = a.slice();
For loop
var a = [ "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello" ]; var b = []; for (let i = 0; i < a.length; ++i) { b.push(a[i]); }
For loop with declared length
var a = [ "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello" ]; var b = []; const length = a.length; for (let i = 0; i < length; ++i) { b.push(a[i]); }
While loop
var a = [ "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello", "hello" ]; var b = []; let i = a.length - 1; while (--i) { b.push(a[i]); }