Run results for: rest parameters vs arguments

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.3 Safari/605.1.15

Browser: Safari 15

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
arguments	5872.0 Ops/sec
rest parameter	6426.5 Ops/sec

Script Preparation code:

function h1(tag, props) {
    props = Object.assign({}, props);
    let length = arguments.length;
    if (length > 3) {
        const children = [];
        while (length-- > 2) {
            children[length - 2] = arguments[length];
        }
        props.children = children;
    } else if (length === 3) {
        props.children = arguments[2];
    }
    return {
        tag,
        props
    };
}

function h2(tag, props, ...children) {
    props = Object.assign({}, props);
    if (children.length > 1) {
        props.children = children;
    } else if (children.length === 1) {
        props.children = children[0];
    }
    return {
        tag,
        props
    };
}

Tests:

arguments
const els = []; for (let i = 0; i < 1000; i++) { if (i % 3 === 0) { els.push(h1('div', {class: 'foo'}, i, i + 1, i + 2)); } else { els.push(h1('div', {class: 'foo'}, i)); } }
rest parameter
const els = []; for (let i = 0; i < 1000; i++) { if (i % 3 === 0) { els.push(h2('div', {class: 'foo'}, i, i + 1, i + 2)); } else { els.push(h2('div', {class: 'foo'}, i)); } }