A module that decorates a passed in object with on, off, and trigger functions.

observableDecorator.js

/**
 * @fileOverview
 * @author Russell Dempsey <[email protected]>
 * 2015
 */

	'use strict';

	var Decoration = {};

	var observableDecorator = function observableDecorator(object) {
		var i = 0;
		var decoratorKeys = Object.keys(Decoration);
		var length = decoratorKeys.length;
		var keyName;
		for (i; i < length; i++) {
			keyName = decoratorKeys[i];
			if (object[keyName] !== undefined) {
				console.log(object);
				throw Error('I am extremely simple, I refuse to handle your complex objects.');
			} else {
				object[keyName] = Decoration[keyName];
			}
		}
	};


	Decoration.listeners = [];

	Decoration.on = function decorationOn(eventName, callbackFunction) {
        if (this.listeners[eventName] === undefined) {
            this.listeners[eventName] = [callbackFunction];
        } else {
            this.listeners[eventName].push(callbackFunction);
        }
    };

    Decoration.off = function decorationOff(eventName, callbackFunction) {
        var group = this.listeners[eventName];
        var match = false;
        var i = 0;
        var length;

        if (group === undefined) {
            return false;
        }
        length = group.length;

        if (callbackFunction !== undefined) {
            for (i; i < length; i++) {
                if (group[i] === callbackFunction) {
                    match = true;
                    group.splice(i, 1);
                }
            }
        }

        if (match === false) {
            this.listeners[eventName] = [];
        }

        return true;
    };

    Decoration.trigger = function decorationTrigger(eventName, data) {
        var group = this.listeners[eventName];
        var i = 0;
        var length;
        if (group === undefined) {
            return false;
        }
        length = group.length;

        for (i; i < length; i++) {
            group[i](data);
        }
    };

	return observableDecorator;