Benchmark: Adding items to an array - MeasureThat.net

Adding items to an array (version: 5)

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

Comparing performance of: arrayUnshift vs arrayConcat vs arraySpread vs arrayPush

Created: 3 years ago by: Registered User

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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);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
arrayUnshift
arrayConcat
arraySpread
arrayPush

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.99 Safari/537.36 Vivaldi/2.9.1705.41

Browser/OS: Chrome 78 on Windows

View result in a separate tab

Test name	Executions per second
arrayUnshift	16288.0 Ops/sec
arrayConcat	489.5 Ops/sec
arraySpread	187.9 Ops/sec
arrayPush	4542563.0 Ops/sec