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Cycle.scala – Scala.js interface to Cycle.js

This is a more or less complete interface to Cycle.js, as well as its DOM and HTTP drivers. The code has a few example components that work. There are many @TODO-s in the code, but Cycle.scala actually works pretty well as-is.

However, after digging into Cycle.js throughout this project I've realized that I just want a different library. Cycle.js is true to its design goals, and I thought I shared them, but turns out that I don't.

I also didn't like how Cycle's DOM driver works with Snabbdom. It is rather inefficient, re-creating way too many virtual nodes on every little change. I believe there's a better way to wire together Snabbdom and FRP. So I decided to build Laminar, a new FRP library based on that idea. Half way into that, I've realized that the whole concept of virtual DOM does not map well to my use case, so I built Scala DOM Builder, a low level DOM manipulation and tree-tracking library, and reworked Laminar to use that instead of Snabbdom, eliminating a lot of complexity.

So I probably won't be further developing this project in the foreseeable future. Cycle.js guys had some pretty exciting things planned for the future, so maybe I'll revisit this eventually.

Further work

If you wanted to pick this up, you should start by replacing the stuff in the com/raquo/snabbdom directory with my Snabbdom.scala project which is basically the same thing extracted into a separate package.

Adding some tests would also be nice. Cycle.js has its own tests but this interface is a thick enough layer that it deserves some tests.

Other than that there aren't really any pressing concerns, just a bunch of minor things to improve.

My Related Projects

• Scala DOM Types – Type definitions that my projects use for all the HTML tags, attributes, properties, and styles
• Scala DOM Builder – Low-level Scala & Scala.js library for building and manipulating DOM trees
• Scala DOM TestUtils – Test that your Javascript DOM nodes match your expectations
• Laminar – Reactive UI library based on Scala DOM Builder
• Snabbdom.scala – Scala.js interface to a popular JS virtual DOM library
• XStream.scala – Scala.js interface to a simple JS reactive streams library

License

Cycle.scala is provided under MIT license. Comments for DOM definitions are courtesy of Mozzilla contributors and are provided under a Creative Commons Attribution-ShareAlike license.