Run results for: js array copy speed comparison

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/131.0.6778.103 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 131

Operating system: iOS 17.7.1

Device Platform: Mobile

Date tested: one year ago

slice

81.7M/s

for loop

62.6M/s

array.from

41.8M/s

foreach

41.3M/s

map

21.1M/s

View exact numbers

Test name	Executions per second
✓ slice	81,699,400 Ops/sec
for loop	62,599,604 Ops/sec
array.from	41,795,576 Ops/sec
foreach	41,307,140 Ops/sec
map	21,055,548 Ops/sec

Tests:

map
const arr = [1,2,3,4,5] const newArr = arr.map(e=>e)
array.from
const arr = [1,2,3,4,5] const newArr = Array.from(arr)
for loop
const arr = [1,2,3,4,5] let newArr = []; for(let i = 0; i < arr.length; i++) { newArr[i] = arr[i]; }
foreach
const arr = [1,2,3,4,5] let newArr = [] arr.forEach(e => { newArr.push(e) })
slice
const arr = [1,2,3,4,5] const newArr = arr.slice()