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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=517210" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:124.0) Gecko/20100101 Firefox/124.0
Browser:
Firefox 124
Operating system:
Linux
Device Platform:
Desktop
Date tested:
2 years ago
Array(n).fill(undefined)
2K/s
for loop push
1K/s
Array.from
722/s
Array.apply(null, { length: 4 })
443/s
[...Array(n).keys()].map(k => undefined)
400/s
View exact numbers
Test name
Executions per second
✓
Array(n).fill(undefined)
1,978 Ops/sec
for loop push
1,403 Ops/sec
Array.from
722 Ops/sec
Array.apply(null, { length: 4 })
443 Ops/sec
[...Array(n).keys()].map(k => undefined)
400 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); }