# six-speed

**Repository Path**: mirrors_jsantell/six-speed

## Basic Information

- **Project Name**: six-speed
- **Description**: ES6 polyfill vs. feature performance tests
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-09-25
- **Last Updated**: 2026-03-01

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# six-speed

ES6 polyfill vs. feature performance tests.

Report is located at http://kpdecker.github.io/six-speed/

## Usage

```
gulp test:sauce
```

Test against all registered Sauce Labs browsers.

```
gulp test:node
```

Tests against the current node version.

```
gulp server
```

Starts a server instance for manual browser testing. Tests may be accessed via `http://machineName:9999/` and the `#` component may be used to filter the tests to be executed, i.e. `http://machineName:9999/#promise`

```
gulp report
```

Generates the data report.


## Testing methodology

For each of the ES6 features in question, a ES5 implementation of that functionality was written along with a ES6 version. It should be noted that the functionality is frequently the same, but in some instances such as the `RegExp` unicode flag, the behaviors are not an exact match. In some cases the "common" vs. "correct" version was written, i.e. using `x[key] = value` vs. `defineProperty` to avoid an uncommon but particular nasty edge case.

Babel, in both loose+runtime and runtime mode, and Traceur were then used to compile the ES6 version to a ES5 compliant version, utilizing the runtime over polyfill to maintain test isolation and avoid native implementations where possible.

All of these test instances were then benchmarked in the given JavaScript engine using [Benchmark.js](http://benchmarkjs.com/) and then the operations per second compared to the ES5 implementation. Cross browser and cross execution comparisions are avoided as much as possible to isolate environmental issues when executing on VMs in the cloud.


## Thanks

Thanks to [BrowserStack](browserstack.com) and [Sauce Labs](https://saucelabs.com/) for providing open source accounts which the majority of this testing was performed on.