MeasureThat.net

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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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:128.0) Gecko/20100101 Firefox/128.0
Firefox 128
Windows
Desktop
9 months ago
Test name Executions per second
Array.prototype.toSpliced 18843596.0 Ops/sec
Array.prototype.slice + Array.prototype.unshift 15991052.0 Ops/sec
Spread operator 20711536.0 Ops/sec
Script Preparation code:
AخA
 
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];