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Run results for:
Array slice() vs slice(0) vs spread operator
Compare the new ES6 spread operator with the traditional slice() methods
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<iframe src="https://measurethat.net/Embed?id=567027" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:132.0) Gecko/20100101 Firefox/132.0
Browser:
Firefox 132
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
one year ago
Array.prototype.slice()
12.8M/s
Array.prototype.slice(0)
12.0M/s
spread operator
2.2M/s
View exact numbers
Test name
Executions per second
✓
Array.prototype.slice()
12,759,441 Ops/sec
Array.prototype.slice(0)
12,008,976 Ops/sec
spread operator
2,172,009 Ops/sec
Script Preparation code:
var baseArray = [] for (var i = 0; i < 50; i++) { baseArray.push((Math.floor(Math.random() * Math.floor(1000000))).toString(16)) }
Tests:
Array.prototype.slice()
var other = baseArray.slice();
spread operator
var other = [ ...baseArray ]
Array.prototype.slice(0)
var other = baseArray.slice(0);