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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.102 Safari/537.36

Browser: Chrome 85

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Array clone with spread operator	7440984.0 Ops/sec
Array clone with slice	8101476.0 Ops/sec
Array addition with spread operator	2902674.0 Ops/sec
Array addition with slice and push	3082992.0 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