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Run results for:
Initializing array with map function - JS version of Python list comprehension
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=573606" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Android 13; Mobile; rv:133.0) Gecko/133.0 Firefox/133.0
Browser:
Firefox Mobile 133
Operating system:
Android
Device Platform:
Mobile
Date tested:
one year ago
Test name
Executions per second
Spread operator
441.7 Ops/sec
Array apply
210.0 Ops/sec
Array from
1218.0 Ops/sec
Array fill
683.6 Ops/sec
For loop push
703.1 Ops/sec
Script Preparation code:
var n = 100000; // 100k function filler(v, i) { return i ** 2; }
Tests:
Spread operator
[...Array(n).keys()].map(filler);
Array apply
Array.apply(null, { length: n }).map(filler);
Array from
Array.from({ length: n }, filler);
Array fill
Array(n).fill(undefined).map(filler)
For loop push
const arr = []; for (let i = 0; i < n; i++) { arr.push(filler(null, i)); }