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Run results for:
Array.from() vs new Array() vs [..Array()]
Testing the difference between creating filled arrays.
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<iframe src="https://measurethat.net/Embed?id=618940" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36 Edg/141.0.0.0
Browser:
Chrome 141
Operating system:
Windows
Device Platform:
Desktop
Date tested:
9 months ago
new Array()
1.0M/s
[...Array()]
977K/s
Array.from()
78K/s
View exact numbers
Test name
Executions per second
✓
new Array()
1,024,004 Ops/sec
[...Array()]
977,232 Ops/sec
Array.from()
78,492 Ops/sec
Script Preparation code:
var mapfn = (_, index) => { return index * 2 % 10; }
Tests:
new Array()
new Array(500).fill(500).map(mapfn)
Array.from()
Array.from({ length: 500 }, mapfn)
[...Array()]
[...Array(500)].map(mapfn)