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Run results for:
Initializing array with n undefined items
worth to note that the maximum callstack size is exceeded for the first test case (spread operator) with n = 1 million
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<iframe src="https://measurethat.net/Embed?id=624694" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/26.2 Safari/605.1.15
Browser:
Safari 26
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
3 months ago
Test name
Executions per second
[...Array(n).keys()].map(k => undefined)
1679.8 Ops/sec
Array.apply(null, { length: 4 })
1016.2 Ops/sec
Array.from
6266.8 Ops/sec
Array(n).fill(undefined)
16540.1 Ops/sec
for loop push
3710.4 Ops/sec
Script Preparation code:
var n = 100000; // 100k
Tests:
[...Array(n).keys()].map(k => undefined)
[...Array(n).keys()].map(k => undefined);
Array.apply(null, { length: 4 })
Array.apply(null, { length: n });
Array.from
Array.from({ length: n }, () => undefined);
Array(n).fill(undefined)
Array(n).fill(undefined)
for loop push
const arr = []; for (let i = 0; i < n; i++) { arr.push(undefined); }