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Run results for:
js array copy speed comparison and spread operator
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Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36
Browser:
Chrome 138
Operating system:
Windows
Device Platform:
Desktop
Date tested:
9 months ago
Test name
Executions per second
map
2292.6 Ops/sec
array.from
2700.4 Ops/sec
for loop
2513.6 Ops/sec
foreach
2449.1 Ops/sec
slice
2670.2 Ops/sec
spread
2672.8 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]