https://github.com/mathiasbynens/String.prototype.startsWith

A robust & optimized ES3-compatible polyfill for the `String.prototype.startsWith` method in ECMAScript 6.
https://github.com/mathiasbynens/String.prototype.startsWith

Last synced: 24 days ago
JSON representation

A robust & optimized ES3-compatible polyfill for the `String.prototype.startsWith` method in ECMAScript 6.

• Host: GitHub
• URL: https://github.com/mathiasbynens/String.prototype.startsWith
• Owner: mathiasbynens
• License: mit
• Created: 2013-12-10T15:21:10.000Z (about 11 years ago)
• Default Branch: main
• Last Pushed: 2024-09-27T14:43:35.000Z (3 months ago)
• Last Synced: 2024-11-05T05:02:57.428Z (about 1 month ago)
• Language: JavaScript
• Homepage: https://mths.be/startswith
• Size: 27.3 KB
• Stars: 144
• Watchers: 7
• Forks: 47
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE-MIT.txt

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README

        
# ES6 `String.prototype.startsWith` polyfill [![string.prototype.startswith on npm](https://img.shields.io/npm/v/string.prototype.startswith)](https://www.npmjs.com/package/string.prototype.startswith)

A robust & optimized polyfill for [the `String.prototype.startsWith` method in ECMAScript 6](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-string.prototype.startswith).

This package implements the [es-shim API](https://github.com/es-shims/api) interface. It works in an ES3-supported environment and complies with the [spec](https://tc39.es/ecma262/#sec-string.prototype.startswith).

Other polyfills for `String.prototype.startsWith` are available:

*  by [Paul Miller](http://paulmillr.com/) (~~fails some tests: [1](https://github.com/paulmillr/es6-shim/issues/167), [2](https://github.com/paulmillr/es6-shim/issues/175)~~ passes all tests)

*  by Google (~~[fails a lot of tests](https://github.com/google/traceur-compiler/pull/554)~~ now uses this polyfill and passes all tests)

## Installation

Via [npm](http://npmjs.org/):

```bash

npm install string.prototype.startswith

```

Then, in [Node.js](http://nodejs.org/):

```js

var startsWith = require('string.prototype.startswith');

```

In a browser:

```html

```

> **NOTE**: It's recommended that you install this module using a package manager

> such as `npm`, because loading multiple polyfills from a CDN (such as `bundle.run`)

> will lead to duplicated code.

## Notes

Polyfills + test suites for [`String.prototype.endsWith`](https://mths.be/endswith) and [`String.prototype.contains`](https://mths.be/contains) are available, too.

## For maintainers

### How to publish a new release

1. On the `main` branch, bump the version number in `package.json`:

    ```sh

    npm version patch

    ```

    Instead of `patch`, use `minor` or `major` [as needed](https://semver.org/).

    Note that this produces a Git commit + tag.

1. Push the release commit and tag:

    ```sh

    git push && git push --tags

    ```

    Our CI then automatically publishes the new release to npm.

## Author

| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias "Follow @mathias on Twitter") |

|---|

| [Mathias Bynens](https://mathiasbynens.be/) |

## License

This polyfill is available under the [MIT](https://mths.be/mit) license.