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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36

Browser: Chrome 83

Operating system: Mac OS X 10.15.4

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Array clone with spread operator	12244730.0 Ops/sec
Array clone with slice	12015810.0 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();

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

Array clone with spread operator

Array clone with slice