freactive

Work in progress!

Overview

The goal of this library is to provide some idioms for functional reactive programming based on Clojure's already existing deref, swap! and reset! patterns.

Example:

(ns test-freactive
  (:refer-clojure :exclude [atom])
  (:require [freactive.core :refer [atom rx lens cursor]))
  
  
(def a1 (atom 0))
(def a2 (atom 0))

(def my-rx (rx (+ @a1 @a2))

(println @my-rx)
;; 0

(swap! a1 inc)

(println @my-rx)
;; 1

All of the data types in this library implement the IDeref interface and when they are deref'ed from another "reactive expression" will be registered as dependents.

Reactive Atoms

Reactive atoms are the same as standard Clojure atoms, except for two differences:

• When deref is called on a reactive atom, it calls a register-dep function with itself as an argument so that it can be registered as a dependency to a computation that has bound the *register-dep* var in the current scope.
• Reactive atoms will not notify their watches unless they have actually changed (i.e. they will do an equality test between the old value and new value before notifying of changes).

Reactive Expressions

A reactive expression is an IDeref instance whose value is the result of a computation that can be updated reactively when it's dependencies are invalidatted.

Reactive Lenses

Reactive Cursors

License

Copyright © 2014 Aaron Craelius Some content Copyright © Rich Hickey

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.