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Run results for:
Array Shallow Copy: Array.prototype.slice() vs. Array.prototype.concat() vs. Spread syntax vs. Array.from()
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<iframe src="https://measurethat.net/Embed?id=500452" 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/120.0.0.0 Safari/537.36 Edg/120.0.0.0
Browser:
Chrome 120
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Array.prototype.slice()
367K/s
Spread syntax
349K/s
Array.from()
327K/s
Array.prototype.concat()
155K/s
View exact numbers
Test name
Executions per second
✓
Array.prototype.slice()
366,564 Ops/sec
Spread syntax
349,096 Ops/sec
Array.from()
327,208 Ops/sec
Array.prototype.concat()
154,814 Ops/sec
Script Preparation code:
var arr = Array(10_000).fill(undefined).map((_, idx) => idx)
Tests:
Array.prototype.slice()
const newArr = arr.slice(0);
Array.prototype.concat()
const newArr = arr.concat([]);
Spread syntax
const newArr = [...arr];
Array.from()
const newArr = Array.from(arr);