MeasureThat.net

Run results for: Adding items to an array

spread vs concat vs unshift vs push There was also push.apply, but the browsers kept running out of memory for those tests. It worked only once. Here's a comparison with just the push results: arrayPush 4763922.0 Ops/sec arrayPush.apply 2666974.0 Ops/sec

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36
Chrome 85
Windows
Desktop
4 years ago
Test name Executions per second
arrayUnshift 19645.5 Ops/sec
arrayConcat 483.5 Ops/sec
arraySpread 155.6 Ops/sec
arrayPush 4554472.5 Ops/sec
Script Preparation code:
AخA
 
var array = [1,2,3];
var array2 = [4,5,6];
Tests:

  • arrayUnshift

     
    array.unshift(...array2);

  • arrayConcat

     
    array = array.concat(array2)

  • arraySpread

     
    array = [...array, ...array2]

  • arrayPush

     
    array.push(...array2);