Run results for: rest parameters vs arguments (no extra args) actual test

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 8 months ago

rest parameter

18K/s

arguments

9K/s

View exact numbers

Test name	Executions per second
✓ rest parameter	18,234 Ops/sec
arguments	9,339 Ops/sec

Script Preparation code:

window.els = [];

function t1() {
  window.els.push(...arguments);
}

function t2(...args) {
  window.els.push(...args);
}

Tests:

arguments
window.els.length = 0; for (let i = 0; i < 2000; i++) { t1('div', {class: 'foo'}, i, i + 1, i + 2); }
rest parameter
window.els.length = 0; for (let i = 0; i < 2000; i++) { t2('div', {class: 'foo'}, i, i + 1, i + 2); }