Run results for: Adding items to an array - 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:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36

Browser: Chrome 85

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
arrayUnshift	16472.7 Ops/sec
arrayConcat	452.8 Ops/sec
arraySpread	145.9 Ops/sec
arrayPush	4763922.0 Ops/sec
arrayPush.apply	2666974.0 Ops/sec

Website performance monitoring

Script Preparation code:

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);