Run results for: splice vs slice

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36 Edg/90.0.818.51

Browser: Chrome 90

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var a = []

for (var i = 0; i < 1000 * 1000; i++) {
  a.push(i);
}

Tests:

slice and slice
var i = a.slice().reverse().findIndex(x => x !== '') a = a.slice(0, a.length - i)
slice and splice
var i = a.slice().reverse().findIndex(x => x !== '') a.splice(a.length - i)
only slice
var i = a.reverse().findIndex(x => x !== '') a = a.slice(i).reverse()
only splice
var i = a.reverse().findIndex(x => x !== '') a.splice(0, i) a.reverse()