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Run results for:
Array.from() vs new Array().fil() vs [..Array()]
Testing the difference between creating filled arrays.
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<iframe src="https://measurethat.net/Embed?id=556045" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; CrOS x86_64 14541.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
Browser:
Chrome 120
Operating system:
Chrome OS 14541.0.0
Device Platform:
Desktop
Date tested:
one year ago
new Array().fill()
53K/s
[...Array()]
52K/s
Array.from()
15K/s
View exact numbers
Test name
Executions per second
✓
new Array().fill()
53,103 Ops/sec
[...Array()]
51,991 Ops/sec
Array.from()
15,241 Ops/sec
Script Preparation code:
var mapfn = (_, index) => { return index * 2 % 10; }
Tests:
new Array().fill()
new Array(500).fill(500).map(mapfn)
Array.from()
Array.from({ length: 500 }, mapfn)
[...Array()]
[...Array(500)].map(mapfn)