Run results for: JavaScript spread vs slice vs for

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36

Browser: Chrome 86

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Array clone: spread operator	10444540.0 Ops/sec
Array clone: slice	11057240.0 Ops/sec
Array Clone: for loop	11680550.0 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: spread operator
const clone = [...list];
Array clone: slice
const clone = list.slice();
Array Clone: for loop
const clone = []; for (let i=0;i<list.length;i++) { clone[i] = list[i]; }

Run results for: JavaScript spread vs slice vs for

Array clone: spread operator

Array clone: slice

Array Clone: for loop