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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0

Browser: Firefox 137

Operating system: Windows

Device Platform: Desktop

Date tested: 27 days ago

Test name	Executions per second
arguments	3921.6 Ops/sec
rest parameter	6787.7 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)); } }