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Run results for:
4-number (float) Array.slice() vs. Spread operator
For times when a shallow copy of an Array is needed, what is the performance difference between these 2 methods.
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<iframe src="https://measurethat.net/Embed?id=604533" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0
Browser:
Firefox 138
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Array.slice()
27.5M/s
Array.slice() with start
27.2M/s
Array.slice() with start and end
27.1M/s
Spread operator
12.4M/s
View exact numbers
Test name
Executions per second
✓
Array.slice()
27,515,848 Ops/sec
Array.slice() with start
27,185,674 Ops/sec
Array.slice() with start and end
27,129,758 Ops/sec
Spread operator
12,419,449 Ops/sec
HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.20/lodash.min.js'></script>
Script Preparation code:
var arr = [1.9, 2.8, 3.7, 4.6];
Tests:
Array.slice()
var myCopy = arr.slice()
Spread operator
var myCopy = [...arr]
Array.slice() with start and end
var myCopy = arr.slice(0, 3)
Array.slice() with start
var myCopy = arr.slice(0)