Benchmark: rest parameters vs arguments

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)); } }

Historical Performance Data aggregated from 31 community runs

Desktop Results:

Chrome 26 runs

rest parameter

7K/s

arguments

6K/s

Fastest: rest parameter (1.2x faster)

View exact numbers

✓ rest parameter: 7,061 ops/sec
• arguments: 6,117 ops/sec

Firefox 5 runs

rest parameter

19K/s

arguments

13K/s

Fastest: rest parameter (1.5x faster)

View exact numbers

✓ rest parameter: 19,410 ops/sec
• arguments: 13,050 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Test case name	Result
arguments
rest parameter

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 140 on Android

View result in a separate tab

rest parameter

3K/s

arguments

2K/s

View exact numbers

Test name	Executions per second
✓ rest parameter	3,347 Ops/sec
arguments	2,442 Ops/sec

rest parameters vs arguments (version: 0) Benchmark.js

Comparing performance of: `arguments vs rest parameter`

Created: 5 years ago by: Guest

Go to the latest result

arguments

rest parameter

Historical Performance Data aggregated from 31 community runs

Desktop Results:

Chrome 26 runs

Firefox 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

rest parameters vs arguments (version: 0) Benchmark.js

Comparing performance of: arguments vs rest parameter

Created: 5 years ago by: Guest

Go to the latest result

arguments

rest parameter

Historical Performance Data aggregated from 31 community runs

Desktop Results:

Chrome 26 runs

Firefox 5 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Comparing performance of: `arguments vs rest parameter`