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Run results for:
Clone and append to beginning of array
Compare the new toSpliced() method, the slice() + unshift() method and the spread operator in cloning and appending an element to the beginning of an array.
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<iframe src="https://measurethat.net/Embed?id=534767" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0
Browser:
Firefox 128
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Spread operator
20.7M/s
Array.prototype.toSpliced
18.8M/s
Array.prototype.slice + Array.prototype.unshift
16.0M/s
View exact numbers
Test name
Executions per second
✓
Spread operator
20,711,536 Ops/sec
Array.prototype.toSpliced
18,843,596 Ops/sec
Array.prototype.slice + Array.prototype.unshift
15,991,052 Ops/sec
Script Preparation code:
var array = ["hello", true, 7]; var newElement = "new";
Tests:
Array.prototype.toSpliced
const newArray = array.toSpliced(0, 0, newElement);
Array.prototype.slice + Array.prototype.unshift
const newArray = array.slice(); newArray.unshift(newElement);
Spread operator
const newArray = [newElement, ...array];