Run results for: splice vs slice

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:88.0) Gecko/20100101 Firefox/88.0

Browser: Firefox 88

Operating system: Mac OS X 10.15

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()