Monthly Archives: April 2014

/* General skeleton for a lazy loading singleton, step 3. */ MyNamespace.Singleton = (function() { var uniqueInstance; // Private attribute that holds the single instance. function constructor() { // All of the normal singleton code goes here. … } return … Continue reading →

  var authorClone = clone(Author); alert(authorClone.name); // Linked to the primative Person.name, which is the // string ‘default name’. authorClone.name = ‘new name’; // A new primative is created and added to the // authorClone object itself. alert(authorClone.name); // Now … Continue reading →

/* Class Person. */ function Person(name) { this.name = name; } Person.prototype.getName = function() { return this.name; } var reader = new Person(‘John Smith’); reader.getName(); /* Class Author. */ function Author(name, books) { Person.call(this, name); // Call the superclass’ constructor … Continue reading →

see the source code : var Book = (function() { // Private static attributes. var numOfBooks = 0; // Private static method. function checkIsbn(isbn) { … } // Return the constructor. return function(newIsbn, newTitle, newAuthor) { // implements Publication // … Continue reading →

privileged method is defined in the constructor, and it is public. it could access the private variable in the constructor, for each new instance, the privileged method would be copied, so it might has performance or memory leak issue.  see … Continue reading →

/** * usage : var Composite = new Interface(‘Composite’, [‘add’, ‘remove’, ‘getChild’]); */ var Interface = function(name, methods) { if(arguments.length != 2) { throw new Error(“Interface constructor called with ” + arguments.length + “arguments, but expected exactly 2.”); } this.name … Continue reading →