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Singleton Pattern,[object Object],Lim Borey,[object Object],Yoolk Inc.,[object Object]
What’s Singleton?,[object Object],[object Object]
Class with a single instance,[object Object]
Encapsulated "just-in-time initialization" or "initialization on first use". Problem,[object Object],[object Object],[object Object]
Implementation in JavaScript,[object Object],Singleton = (function() {,[object Object],var privateAttribute1 = false;,[object Object],var privateAttribute2 = [1, 2, 3];,[object Object],return { ,[object Object],		publicAttribute1: true,,[object Object],		publicAttribute2: 10,,[object Object],		publicMethod1: function() {,[object Object],			...,[object Object],		},,[object Object],		publicMethod2: function(args) {,[object Object],			...,[object Object],		},[object Object],	};,[object Object],})();,[object Object]
Lazy Instantiate Singleton,[object Object],Singleton = (function() {,[object Object],varuniqueInstance; // Private attribute that holds the single instance.,[object Object],    function constructor() { // All of the normal singleton code goes here.,[object Object],        return{,[object Object],            greeting : function() { alert("hello"); },[object Object],        },[object Object],    },[object Object],    return {,[object Object],getInstance: function() {,[object Object],            if(!uniqueInstance) { // Instantiate only if the instance doesn't exist.,[object Object],uniqueInstance = constructor();,[object Object],            },[object Object],            return uniqueInstance;,[object Object],        },[object Object],    },[object Object],})();,[object Object],Singleton.getInstance().greeting();,[object Object]
References,[object Object],Singleton pattern (2010, Feb 08),  http://en.wikipedia.org/wiki/Singleton_pattern,[object Object],Erich G., Richard H., Ralph J., John M. V., 1995,  Design Patterns: Elements of Reusable Object-Oriented Software, Addison-Wesley Professional,[object Object],Ross H., Dustin D. , 2007, Pro JavaScript™ Design Patterns, Apress,[object Object]

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Singleton Pattern

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