Run results for: SPlICE + UNSHIFT vs SORT (10000 items)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser: Chrome 132

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
SPLICE + UNSHIFT: array 10000 items; itemIndex - 10000	24645.5 Ops/sec
SORT: array 10000 items; itemIndex - 10000	5206.4 Ops/sec

Script Preparation code:

var arr = [...Array(10000)].map((_,i) => i)

Tests:

SPLICE + UNSHIFT: array 10000 items; itemIndex - 10000
let newArr = [...arr] const item = 9999 const itemIndex = newArr.findIndex((x) => x === item) console.log('SPLICE + UNSHIFT [0] before', newArr[0]) console.log('SPLICE + UNSHIFT length before', newArr.length) newArr.splice(itemIndex, 1) newArr.unshift(item) console.log('SPLICE + UNSHIFT [0] after', newArr[0]) console.log('SPLICE + UNSHIFT length after', newArr.length)
SORT: array 10000 items; itemIndex - 10000
let newArr = [...arr] const item = 9999 const itemIndex = newArr.findIndex((x) => x === item) console.log('SORT [0] before', newArr[0]) console.log('SORT length before', newArr.length) newArr = newArr.sort((a, b) => { if (a === item) { return -1 } if (b === item) { return 1 } return 0 }) console.log('SORT [0] after', newArr[0]) console.log('SORT length after', newArr.length)