bensu / zelkova

Elm-style FRP for Clojure and ClojureScript

Zelkova

Elm-style FRP for Clojure and ClojureScript.

Here's a conference talk with some demos!

Here's a mailing list on Google Groups!

Bullet points

• signal graphs are static, just like in Elm (why?)
• core.async is used to wire up running graphs
• you can run as many signal graphs as you want at the same time
• graphs can share signal nodes because each signal is just a "recipe" value decoupled from the state of any running graph
• works in both Clojure and ClojureScript, but ClojureScript is currently better supported with implementations for keyboard, mouse, and window signals (basically straight ports from the Elm libraries)
• pairs really well with immediate-mode rendering (e.g. React-based systems like Om or Reagent)
• transducer pipelines!!

What does it look like?

(ns my-app.ui
  (:require [jamesmacaulay.zelkova.signal :as z]
            [jamesmacaulay.zelkova.keyboard :as keyboard]
            [jamesmacaulay.zelkova.mouse :as mouse]))

(def saved-points-signal
  (let [shift-clicks (z/keep-when keyboard/shift mouse/clicks)]
    (->> mouse/position
         (z/sample-on shift-clicks)
         (z/reductions conj #{}))))

(def saved-points-atom
  (z/pipe-to-atom saved-points-signal))

Examples

• Quil Flyer (source)
• Om Search (source)
• Todo MVC (source)
• Mario (source)
• Drag and Drop (source)

License

Copyright © 2014-2015

Distributed under the MIT License.