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Run results for:
4-element 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=614449" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0
Browser:
Firefox 141
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Array.slice()
91.9M/s
Array.slice() with start and end
91.1M/s
Spread operator
48.8M/s
View exact numbers
Test name
Executions per second
✓
Array.slice()
91,900,024 Ops/sec
Array.slice() with start and end
91,066,064 Ops/sec
Spread operator
48,788,420 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)