ES6 String.prototype.codePointAt polyfill

A robust & optimized polyfill for the String.prototype.codePointAt 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.codePointAt are available:

• http://norbertlindenberg.com/2012/05/ecmascript-supplementary-characters/#String by Norbert Lindenberg (fails some tests)
• https://gist.github.com/slevithan/2290602 by Steven Levithan (fails some tests)
• https://github.com/paulmillr/es6-shim/blob/8e570a4b425a80f9b13ff027dbd28d65f201a319/es6-shim.js#L171-L183 by Paul Miller (fails some tests passes all tests)

Installation

Via npm:

npm install string.prototype.codepointat

Then, in Node.js:

require('string.prototype.codepointat');

// On Windows and on Mac systems with default settings, case doesn’t matter,
// which allows you to do this instead:
require('String.prototype.codePointAt');

In a browser:

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

A polyfill + test suite for String.fromCodePoint is 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 -m 'Release v%s'
   

   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

Mathias Bynens

License

This polyfill is available under the MIT license.