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Run results for:
Initializing array with map function
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=573596" 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
for loop push
4K/s
Array.from
3K/s
Array(n).fill(undefined).map(filler)
2K/s
[...Array(n).keys()].map(filler)
1K/s
Array.apply(null, { length: 4 }).map(filler)
499/s
View exact numbers
Test name
Executions per second
✓
for loop push
3,535 Ops/sec
Array.from
2,797 Ops/sec
Array(n).fill(undefined).map(filler)
1,642 Ops/sec
[...Array(n).keys()].map(filler)
1,034 Ops/sec
Array.apply(null, { length: 4 }).map(filler)
499 Ops/sec
Script Preparation code:
var n = 100000; // 100k function filler(v, i) { return i ** 2; }
Tests:
[...Array(n).keys()].map(filler)
[...Array(n).keys()].map(filler);
Array.apply(null, { length: 4 }).map(filler)
Array.apply(null, { length: n }).map(filler);
Array.from
Array.from({ length: n }, filler);
Array(n).fill(undefined).map(filler)
Array(n).fill(undefined).map(filler)
for loop push
const arr = []; for (let i = 0; i < n; i++) { arr.push(filler(null, i)); }