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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=617493" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 17_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 17
Operating system:
iOS 17.6.1
Device Platform:
Mobile
Date tested:
10 months ago
Array.from({ length:n }, (item, i) => i)
470K/s
Array.from({ length: n })
253K/s
Array(n).fill(null)
142K/s
[...Array(n)]
130K/s
Array.apply(null, Array(n))
65K/s
View exact numbers
Test name
Executions per second
✓
Array.from({ length:n }, (item, i) => i)
469,930 Ops/sec
Array.from({ length: n })
253,374 Ops/sec
Array(n).fill(null)
142,100 Ops/sec
[...Array(n)]
130,201 Ops/sec
Array.apply(null, Array(n))
64,850 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);