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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=573561" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:133.0) Gecko/20100101 Firefox/133.0
Browser:
Firefox 133
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Array(n).fill(undefined)
4K/s
for loop push
3K/s
Array.from
2K/s
[...Array(n).keys()].map(k => undefined)
828/s
Array.apply(null, { length: 4 })
623/s
View exact numbers
Test name
Executions per second
✓
Array(n).fill(undefined)
3,669 Ops/sec
for loop push
3,468 Ops/sec
Array.from
1,678 Ops/sec
[...Array(n).keys()].map(k => undefined)
828 Ops/sec
Array.apply(null, { length: 4 })
623 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); }