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Run results for:
compare the ways to generate a random array for iteration + while
- 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=507333" 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/121.0.0.0 Safari/537.36
Browser:
Chrome 121
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
while(up--) myArray.push(Math.random());
5K/s
Array(n).fill(null)
5K/s
[...Array(n)]
5K/s
Array.from({ length: n })
4K/s
Array.from({ length:n }, (item, i) => i)
4K/s
View exact numbers
Test name
Executions per second
✓
while(up--) myArray.push(Math.random());
5,330 Ops/sec
Array(n).fill(null)
5,253 Ops/sec
[...Array(n)]
5,191 Ops/sec
Array.from({ length: n })
4,117 Ops/sec
Array.from({ length:n }, (item, i) => i)
3,967 Ops/sec
Tests:
[...Array(n)]
[...Array(1000)].map(() => Math.random());
Array(n).fill(null)
Array(1000).fill(null).map(() => Math.random());
Array.from({ length: n })
Array.from({ length: 1000 }).map(() => Math.random());
Array.from({ length:n }, (item, i) => i)
Array.from({ length:1000 }, () => Math.random());
while(up--) myArray.push(Math.random());
let myArray = []; let up = 1000; while(up--) myArray.push(Math.random());