Prototype and method

Question

I want to know about inheritance in JavaScript through prototypes and methods with an (clear understandable) example?

I want to know its all possible scenarios. (i know classical inheritance is not supported but still powerful)

If someone could help , it would be really appreciated.

Thanks

---

maifs

Answer 1

This may not be what you were looking for, but I would strongly recommend the book JavaScript Patterns by Stoyan Stefanov.  He covers things like this in his book and I found it very helpful as a JavaScript newbie last year.

Answer 2

WinJS has Class methods for defining classes and Deriving methods for inheritance.

There is a Quickstart document that references both methods here.

Quick snippet:

Create a class:

var Quadruped= WinJS.Class.define(
//constructor
    function (name) { this.name = name; },

    {
//instance fields, properties
        name: 
{ get: function () { return this.name; } },
        walk:function(){ 
/*do some walking*/;
;}
    },
{
//static fields, properties
    bloodTemperature:"Warm"
}
    
);

Derive:

var Dog = WinJS.Class.derive(Quadruped, 
    // The constructor function.
    function (name) {
        this.name = name;
    },
    // Additional instance members.
    { fleas: 0 },
    // Additional static members.
    { legs: 4 });
var myDog = new Dog("Scotty");
Dog.walk();
Dog.fleas=10;
console.log(Dog.bloodTemperature);
console.log(Dog.name);

Answer 3

Thanks Adam and Ealsur for your effort. Really appreciated and helpful.

I 'll mark as Answer both of your post but right now , i need some more stuff  for example :  overdding  and other possible things.

I want to get some more common details on it.

---

maifs

Answer 4

Overriding can be achieved by defining a method with the same name when you call WinJS.Class.derive within the instance members declaration.

Not really sure what other things you need, but you can also define Namespaces (like in c#) through WinJS.Namespace.define to group your Classes or objects and finally, you can "mix" 2 Classes with WinJS.Class.mix to create a Class that its the union of two given Classes.

Answer 5

Hi Mehmood,

As Ealsur has suggested, you can use those WinJS.xxx methods to help you define javascript class (or class inheritance) in Windows Store javascript app. This helps much for releasing you from handle those syntax details your self.

If you want to get details about how the standard javascript (not WinJS specific) works with OOP programming, you can search for some online articles with "javascript  OOP" like keywords. Here are some ones I've found in web search engine:)

#JavaScript and Object Oriented Programming (OOP)
http://www.javascriptkit.com/javatutors/oopjs.shtml

#Introduction to Object-Oriented JavaScript
https://developer.mozilla.org/en-US/docs/JavaScript/Introduction_to_Object-Oriented_JavaScript?redirectlocale=en-US&redirectslug=Introduction_to_Object-Oriented_JavaScript

#Object-Oriented Programming with JavaScript, Part I: Inheritance - Doc JavaScript
http://www.webreference.com/js/column79/index.html

BTW, you can also find some books on amazon.com talking about using javascript for Object-Oriented programming.

---

Please remember to mark the replies as answers if they help and unmark them if they provide no help.