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Run results for:
js array copy speed comparison and spread operator
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=626470" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36
Browser:
Chrome 145
Operating system:
Windows
Device Platform:
Desktop
Date tested:
4 months ago
array.from
3K/s
spread
3K/s
slice
3K/s
for loop
3K/s
foreach
3K/s
map
2K/s
View exact numbers
Test name
Executions per second
✓
array.from
2,796 Ops/sec
spread
2,780 Ops/sec
slice
2,767 Ops/sec
for loop
2,598 Ops/sec
foreach
2,582 Ops/sec
map
2,318 Ops/sec
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]