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

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mathiasbynens/String.prototype.startsWith

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ES6 String.prototype.startsWith polyfill string.prototype.startswith on npm

A robust & optimized polyfill for the String.prototype.startsWith method in ECMAScript 6.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.

Other polyfills for String.prototype.startsWith are available:

Installation

Via npm:

npm install string.prototype.startswith

Then, in Node.js:

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

In a browser:

<script src="https://bundle.run/string.prototype.startswith"></script>

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 and String.prototype.contains are available, too.

For maintainers

How to publish a new release

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

    npm version patch

    Instead of patch, use minor or major as needed.

    Note that this produces a Git commit + tag.

  2. Push the release commit and tag:

    git push && git push --tags

    Our CI then automatically publishes the new release to npm.

Author

twitter/mathias
Mathias Bynens

License

This polyfill is available under the MIT license.

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

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