Run results for: js array copy speed comparison and spread operator

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:130.0) Gecko/20100101 Firefox/130.0

Browser: Firefox 130

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Tests:

map
const arr = Array.from({ length: 10_000 }, (_, i) => i) const newArr = arr.map(e=>e)
array.from
const arr = Array.from({ length: 10_000 }, (_, i) => i) const newArr = Array.from(arr)
for loop
const arr = Array.from({ length: 10_000 }, (_, i) => i) let newArr = []; for(let i = 0; i < arr.length; i++) { newArr[i] = arr[i]; }
foreach
const arr = Array.from({ length: 10_000 }, (_, i) => i) let newArr = [] arr.forEach(e => { newArr.push(e) })
slice
const arr = Array.from({ length: 10_000 }, (_, i) => i) const newArr = arr.slice()
spread
const arr = Array.from({ length: 10_000 }, (_, i) => i) const newArr = [...arr]