How do you write a class in javascript?

Question

Possible duplicate:
What is the best way to define a class in javascript

How do you write a class in javascript? Is it possible?

Answer 1

Well, JavaScript is a prototype-based language, it has no classes, but you can have classic inheritance and other behavior reuse patterns by cloning objects and prototyping.

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Answer 2

function Foo() { // constructor } Foo.prototype.bar = function() { // bar function within foo } 

Answer 3

Javascript uses the prototype OO by default.

However, if you use a prototype library, for example, you can use Class.create ().

http://prototypejs.org/api/class/create

This will allow you to create (or inherit) a class, after which you will create instances with new ones.

Other libraries probably have similar capabilities.

Answer 4

If you use a library such as a prototype or jQuery, this is much simpler, but the legacy way is to do this.

 function MyClass(){ } MyClass.prototype.aFunction(){ } var instance = new MyClass(); instance.aFunction(); 

Here you can read here http://www.komodomedia.com/blog/2008/09/javascript-classes-for-n00bs/

Answer 5

This "kind of" is possible. Prototype has built-in help when writing classes in JS. Take a look at this detailed description of how you can do this.

 var namedClass = Class.create({ initialize: function(name) { this.name = name; } getName: function() { return this.name; } }); var instance = new namedClass('Foobar'); 

Answer 6

JavaScript is based on objects, not classes. It uses prototype inheritance, not classic inheritance.

JavaScript is flexible and easily extensible. As a result, there are many libraries that add classic JavaScript inheritance. However, using them, you run the risk of writing code that is difficult for most JavaScript programmers to execute.