Created
January 3, 2016 23:09
-
-
Save slmyers/d9b3dbeac2e51383c817 to your computer and use it in GitHub Desktop.
Use case for es2015 weark map. A dictionary for listeners. A map would leak whereas this will not.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
var listenableMap = new WeakMap(); | |
export function getListenable (object) { | |
if (!listenableMap.has(object)) { | |
listenableMap.set(object, {}); | |
} | |
return listenableMap.get(object); | |
} | |
export function getListeners (object, identifier) { | |
var listenable = getListenable(object); | |
listenable[identifier] = listenable[identifier] || []; | |
return listenable[identifier]; | |
} | |
export function on (object, identifier, listener) { | |
var listeners = getListeners(object, identifier); | |
listeners.push(listener); | |
} | |
export function removeListener (object, identifier, listener) { | |
var listeners = getListeners(object, identifier); | |
var index = listeners.indexOf(listener); | |
if(index !== -1) { | |
listeners.splice(index, 1); | |
} | |
} | |
export function emit (object, identifier, ...args) { | |
var listeners = getListeners(object, identifier); | |
for (var listener of listeners) { | |
listener.apply(object, args); | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment