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

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:123.0) Gecko/20100101 Firefox/123.0

Browser: Firefox 123

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 2 years ago

Array clone with spread operator

289.8M/s

Array addition with spread operator

197.1M/s

Array clone with slice

93.2M/s

Array addition with slice and push

73.3M/s

View exact numbers

Test name	Executions per second
✓ Array clone with spread operator	289,754,400 Ops/sec
Array addition with spread operator	197,095,888 Ops/sec
Array clone with slice	93,216,128 Ops/sec
Array addition with slice and push	73,293,200 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);