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Run results for:
js array copy speed comparison with spread operator
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Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36
Browser:
Chrome 142
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
6 months ago
Test name
Executions per second
map
96959472.0 Ops/sec
array.from
75606400.0 Ops/sec
for loop
59500612.0 Ops/sec
foreach
58335808.0 Ops/sec
slice
119085120.0 Ops/sec
spread
85195832.0 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()
spread
const arr = [1,2,3,4,5] const newArr = [...arr]