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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.1

Device Platform: Mobile

Date tested: one year ago

Array clone with spread operator

16.5M/s

Array clone with slice

13.5M/s

View exact numbers

Test name	Executions per second
✓ Array clone with spread operator	16,491,702 Ops/sec
Array clone with slice	13,509,463 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();