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Run results for:
compare the ways to generate an empty array for iteration
- Array.apply: Array.apply(null, Array(100)) - Destructuring operator: [...Array(100)] - Array.prototype.fill Array(100).fill(undefined) - Array.from Array.from({ length: 100 })
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<iframe src="https://measurethat.net/Embed?id=500626" 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/121.0.0.0 Safari/537.36
Browser:
Chrome 121
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Array(n).fill(null)
347K/s
[...Array(n)]
335K/s
Array.apply(null, Array(n))
235K/s
Array.from({ length: n })
40K/s
Array.from({ length:n }, (item, i) => i)
35K/s
View exact numbers
Test name
Executions per second
✓
Array(n).fill(null)
346,694 Ops/sec
[...Array(n)]
334,684 Ops/sec
Array.apply(null, Array(n))
235,325 Ops/sec
Array.from({ length: n })
39,704 Ops/sec
Array.from({ length:n }, (item, i) => i)
35,184 Ops/sec
Tests:
Array.apply(null, Array(n))
Array.apply(null, Array(1000)).map((item, i) => i);
[...Array(n)]
[...Array(1000)].map((item, i) => i);
Array(n).fill(null)
Array(1000).fill(null).map((item, i) => i);
Array.from({ length: n })
Array.from({ length: 1000 }).map((item, i) => i);
Array.from({ length:n }, (item, i) => i)
Array.from({ length:1000 }, (item, i) => i);