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Run results for:
JS Fastest Array Shallow Copy21312312
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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<iframe src="https://measurethat.net/Embed?id=580307" 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
Array.slice
105.9M/s
Array.concat
63.2M/s
View exact numbers
Test name
Executions per second
✓
Array.slice
105,881,800 Ops/sec
Array.concat
63,243,080 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 other = Array.from(a);
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();