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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=518510" 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/123.0.0.0 Safari/537.36
Browser:
Chrome 123
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
[...Array(n)]
290K/s
Array(n).fill(null)
277K/s
Array.apply(null, Array(n))
178K/s
Array.from({ length: n })
21K/s
Array.from({ length:n }, (item, i) => i)
19K/s
View exact numbers
Test name
Executions per second
✓
[...Array(n)]
290,346 Ops/sec
Array(n).fill(null)
277,360 Ops/sec
Array.apply(null, Array(n))
177,822 Ops/sec
Array.from({ length: n })
20,870 Ops/sec
Array.from({ length:n }, (item, i) => i)
18,994 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);