kor is a JavaScript library supporting reactive programming. It is actually just a tiny subset of the excellent Knockout library with all the stuff to do with binding to the DOM removed. This is because there are several ways to achieve the DOM-binding part (for example, React) but which lack anything as mature or helpful as Knockout's reactive programming support.

By cutting Knockout down to its core (or kor?) we end up with a library that is only 5.4 KB in size (minified+gzipped) and yet supplies the support needed for convenient reactive programming.

Authorship

Given kor's obvious direct heritage, it would be ridiculous for me to claim authorship - I just deleted a bunch of stuff. At the same time the Knockout team have not decided to create this subset so they should not be blamed for any shortcomings it suffers from.

Therefore to give credit and blame where its due, let's say:

Copyright (c) Steven Sanderson, the Knockout.js team, and other contributors http://knockoutjs.com/, with parts deleted by Daniel Earwicker

License

MIT license - http://www.opensource.org/licenses/mit-license.php

What survived?

The surviving functions work exactly the same as in Knockout. The only difference is that when loaded by a script tag in the browser, the root object is called kor instead of ko, to avoid collision with Knockout:

• kor.observable
• kor.observableArray
• kor.computed and kor.pureComputed (prefer the latter)
• kor.extenders and built-ins such as throttle, rateLimit
• kor.unwrap and kor.peekObservable
• kor.toJS

As a bonus, I've also integrated the knockout.clear extension that I put together with a lot of help from Michael Best of the Knockout team, so that includes:

• kor.unpromise
• kor.execute

You can find complete documentation for all these features in their respective source libraries:

• knockoutjs.com
• knockout.clear

Using with Knockout plugins

There are extension libraries that work alongside Knockout, such as Mapping

In the browser, if you are just using a script tag to import kor, you would need to "rename" kor by doing this before you load any extension libraries:

window.ko = window.kor;

Of course, this is only useful if the extension library is satisfied by the subset retained in kor.

(NB. I'm planning to fix knockout.clear so it automatically works with kor).

TypeScript

There are type declarations in the typings folder.