Run results for: JavaScript spread operator vs Slice/Splice performance, passing

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; SAMSUNG SM-N975F) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/17.0 Chrome/96.0.4664.104 Mobile Safari/537.36

Browser: Chrome Mobile 96

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
Array clone with spread operator	6392825.0 Ops/sec
Array clone with slice	6868096.0 Ops/sec
Array addition with spread operator	2304946.0 Ops/sec
Array addition with slice and push	2516468.0 Ops/sec
Array removal with spread operator	1555341.0 Ops/sec
Array removal with slice and splice	3126454.0 Ops/sec
Array update with spread operator	1049135.0 Ops/sec

Script Preparation code:

const ITERATIONS = 500000;
var index = ITERATIONS/2;
var n = Math.random();

var list = [];
for (let i = 0; i < length; i += 1) {
  list.push(Math.random());
}

Tests:

Array clone with spread operator
const clone = [...list];
Array clone with slice
const clone = list.slice();
Array addition with spread operator
const clone = [...list, n];
Array addition with slice and push
const clone = list.slice(); clone.push(n);
Array removal with spread operator
const clone = [ ...list.slice(0, index), ...list.slice(index + 1), ];
Array removal with slice and splice
const clone = list.slice(); clone.splice(index, 1);
Array update with spread operator
const clone = [ ...list.slice(0, index), n, ...list.slice(index + 1), ];

Run results for: JavaScript spread operator vs Slice/Splice performance, passing

Array clone with spread operator

Array clone with slice

Array addition with spread operator

Array addition with slice and push

Array removal with spread operator

Array removal with slice and splice

Array update with spread operator