Run results for: shift vs slice (copy array)

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_7 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.7.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.7

Device Platform: Mobile

Date tested: 7 months ago

manual

222.0M/s

shift

60.8M/s

slice

20.3M/s

View exact numbers

Script Preparation code:

const array = []
for (let i = 0; i < 1e3; ++i) array.push(i)

Tests:

shift
array.shift()
slice
array.slice(1)
manual
for (let i = 1; i < array.length; ++i) array[i - 1] = array[i] array.pop()