Run results for: JavaScript spread operator vs Slice/Splice performance - 2

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_4_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.4.1

Device Platform: Mobile

Date tested: one month ago

Test name	Executions per second
Array clone with spread operator	23071070.0 Ops/sec
Array clone with slice	16068320.0 Ops/sec
Array addition with spread operator	12467180.0 Ops/sec
Array addition with slice and push	8467081.0 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);

Run results for: JavaScript spread operator vs Slice/Splice performance - 2

Array clone with spread operator

Array clone with slice

Array addition with spread operator

Array addition with slice and push