@delonnewman/atom/atom.min.js

Shared, synchronous, independent state - Clojure Atoms for Javascript

(function(){function alwaysValid(){return true}function Atom(val,options){var watchers={};var validator=options&&options.validator||alwaysValid;function transition(next){if(!validator(next)){var err=new Error(next+" failed validation");err.name="AssertionError";throw err}var prev=val;val=next;Object.keys(watchers).forEach(function(k){watchers[k].call(null,k,atom,prev,next)})}this.addWatch=function(key,fn){watchers[key]=fn;return this};this.removeWatch=function(key){delete watchers[key];return this};this.swap=function(fn){var args=[val].concat([].slice.call(arguments,1));transition(fn.apply(null,args));return this};this.reset=function(v){transition(v);return this};this.compareAndSet=function(oldVal,newVal){if(oldVal===val){this.reset(newVal);return true}return false};this.deref=function(){return val};this.toString=function(){return"Atom("+JSON.stringify(val)+")"}}function atom(val,options){return new Atom(val,options)}atom.deref=function(ref){return ref.deref()};atom.isAtom=function(val){return val instanceof Atom};if(typeof module!=="undefined"){module.exports=atom}else{window.atom=atom}}).call(this);