3 ways to define a JavaScript class

Introduction JavaScript is a very flexible object-oriented language when it comes to syntax. In this article you can find three ways of defining and instantiating an object. It's important to note that there are no classes in JavaScript. 1. This is probably one of the most common ways. function Apple (type) { this.type = type; this.color = "red"; this.getInfo = getAppleInfo; } function getAppleInfo() { return this.color + ' ' + this.type + ' apple'; } To instantiate an object using the Apple constructor function, set some properties and call methods you can do the following: var apple = new Apple('macintosh'); apple.color = "reddish"; alert(apple.getInfo()); 1.1. In the example above you see that the method getInfo() of the Apple "class" was defined in a separate function getAppleInfo(). function Apple (type) { this.type = type; this.color = "red"; this.getInfo = function() { return this.color + ' ' + this.type + ' apple'; }; } 1.2. 2. apple.color = "reddish"; alert(apple.getInfo()); 3.

Object-Oriented Programming with JavaScript, Part I: Inheritance: Inheritance through Functions - Doc JavaScript - Webreference.com Object-Oriented Programming with JavaScript, Part I: Inheritance Inheritance through Functions Although JavaScript does not support an explicit inheritance operator, you can implement inheritance in other ways. There are two different ways to establish a hierarchy of classes in JavaScript. The first method to create an object as a subclass of another object, is to call the superclass constructor function inside the subclass object definition. function superClass() { this.bye = superBye; this.hello = superHello; } function subClass() { this.inheritFrom = superClass; this.inheritFrom(); this.bye = subBye; } function superHello() { return "Hello from superClass"; } function superBye() { return "Bye from superClass"; } function subBye() { return "Bye from subClass"; } function printSub() { var newClass = new subClass(); alert(newClass.bye()); alert(newClass.hello()); } Convince yourself that it is working correctly. this.inheritFrom = superClass; this.inheritFrom(); Let's take another example.

Inheritance and the prototype chain - JavaScript JavaScript is a bit confusing for developers experienced in class-based languages (like Java or C++), as it is dynamic and does not provide a class implementation (although the keyword class is a reserved keyword and cannot be used as a variable name). When it comes to inheritance, JavaScript only has one construct: objects. Each object has an internal link to another object called its prototype. That prototype object has a prototype of its own, and so on until an object is reached with null as its prototype. null, by definition, has no prototype, and acts as the final link in this prototype chain. While this is often considered to be one of JavaScript's weaknesses, the prototypal inheritance model is in fact more powerful than the classic model. Inheritance with the prototype chain Inheriting properties JavaScript objects are dynamic "bags" of properties (referred to as own properties) and each one has a link to a prototype object. In this example, someObject. Inheriting "methods"

oop - What's the best way to define a class in JavaScript Classical Inheritance in JavaScript Douglas Crockford www.crockford.com And you think you're so clever and classless and free — John Lennon JavaScript is a class-free, object-oriented language, and as such, it uses prototypal inheritance instead of classical inheritance. This can be puzzling to programmers trained in conventional object-oriented languages like C++ and Java. JavaScript's prototypal inheritance has more expressive power than classical inheritance, as we will see presently. But first, why do we care about inheritance at all? The second reason is code reuse. To demonstrate this, we will introduce a little sugar which will let us write in a style that resembles a conventional classical language. Classical Inheritance First, we will make a Parenizor class that will have set and get methods for its value, and a toString method that will wrap the value in parens. The syntax is a little unusual, but it is easy to recognize the classical pattern in it. So now we can write As you would expect, myString is "(0)". Sugar

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