Run results for: Spread operator vs Array.prototype.concat() for large arrays

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser: Chrome 103

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Array.prototype.concat()	7.6 Ops/sec
Spread operator	2.2 Ops/sec

Script Preparation code:

var mainArray = Array.from({ length: 10000000 }, (_, i) => i + 1)
var arrayToConcat = Array.from({ length: 10000000 }, (_, i) => Math.random() * i)

AخA
 
var mainArray = Array.from({ length: 10000000 }, (_, i) => i + 1)var arrayToConcat = Array.from({ length: 10000000 }, (_, i) => Math.random() * i)

Tests:

Array.prototype.concat()
const result = mainArray.concat(arrayToConcat)
const result = mainArray.concat(arrayToConcat)
Spread operator
const result = [...mainArray, ...arrayToConcat]
const result = [...mainArray, ...arrayToConcat]

Run results for: Spread operator vs Array.prototype.concat() for large arrays

Which one is fastest?

Array.prototype.concat()

Spread operator