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

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/137.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 137

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

rest parameter

3K/s

arguments

3K/s

View exact numbers

Test name	Executions per second
✓ rest parameter	2,776 Ops/sec
arguments	2,628 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++) { if (i % 3 === 0) { els.push(t1('div', {class: 'foo'}, i, i + 1, i + 2)); } else { els.push(t1('div', {class: 'foo'}, i)); } }
rest parameter
window.els.length = 0; for (let i = 0; i < 2000; i++) { if (i % 3 === 0) { els.push(t2('div', {class: 'foo'}, i, i + 1, i + 2)); } else { els.push(t2('div', {class: 'foo'}, i)); } }