string.prototype.endswith

An ESnext spec-compliant String.prototype.endsWith shim/polyfill/replacement that works as far down as ES3.

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

Because String.prototype.endsWith depends on a receiver (the this value), the main export takes the string to operate on as the first argument.

Other polyfills for String.prototype.endsWith are available:

• https://github.com/paulmillr/es6-shim/blob/d8c4ec246a15e7df55da60b7f9b745af84ca9021/es6-shim.js#L175-L184 by Paul Miller (fails some tests: 1, 2 passes all tests)
• https://github.com/google/traceur-compiler/blob/315bdad05d41de46d25337422d66686d63100d7a/src/runtime/polyfills/String.js#L39-L66 by Google (fails a lot of tests now uses this polyfill and passes all tests)

Installation

Via npm:

npm install string.prototype.endswith

Then, in Node.js:

var endsWith = require('string.prototype.endswith');

<script src="https://bundle.run/string.prototype.endswith"></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.startsWith and String.prototype.contains are available, too.

Author

Mathias Bynens

License

This polyfill is available under the MIT license.

Tests

Simply clone the repo, npm install, and run npm test