Yeah this just comes across as a tacky way to sell your post to more people and get more readers (that's the way it came across to me).
If you wanted feedback then just say so and post a link instead. Sent from my iPhone On 23 Dec 2011, at 20:01, Nick Morgan <[email protected]> wrote: > It would be better to just put a link to your blog post, and let us know why > you're posting it - would you like feedback? > > On 22 December 2011 02:16, Admin Cyberminds <[email protected]> wrote: > If you have done Object Oriented Programming in JavaScript, you will > know that you can create a class as follows: > > Person = function(id, name, age){ > this.id = id; > this.name = name; > this.age = age; > alert('A new person has been accepted'); > } > > So far our class person only has two properties and we are going to > give it some methods. A clean way of doing this is > to use its 'prototype' object. > Starting from JavaScript 1.1, the prototype object was introduced in > JavaScript. This is a built in object that > simplifies the process of adding custom properties and methods to all > instances of an object. > Let's add 2 methods to our class using its 'prototype' object as > follows: > > Person.prototype = { > /** wake person up */ > wake_up: function() { > alert('I am awake'); > }, > > /** retrieve person's age */ > get_age: function() { > return this.age; > } > } > > Now we have defined our class Person. What if we wanted to define > another class called Manager which inherits some properties from > Person. There is no point redefining all this properties again when we > define our Manager class, we can just set it to inherit from the class > Person. > JavaScript doesn't have built in inheritance but we can use a > technique to implement inheritance as follows: > > `Inheritance_Manager = {};`//We create an inheritance manager class > (the name is arbitrary) > > Now let's give our inheritance class a method called extend which > takes the baseClass and subClassas arguments. > Within the extend method, we will create an inner class called > inheritance function inheritance() { }. The reason why we are using > this inner > class is to avoid confusion between the baseClass and subClass > prototypes. > Next we make the prototype of our inheritance class point to the > baseClass prototype as with the following code: > inheritance.prototype = baseClass. prototype; > Then we copy the inheritance prototype into the subClass prototype as > follows: subClass.prototype = new inheritance(); > The next thing is to specify the constructor for our subClass as > follows: subClass.prototype.constructor = subClass; > Once finished with our subClass prototyping, we can specify the next > two lines of code to set some base class pointers. > > subClass.baseConstructor = baseClass; > subClass.superClass = baseClass.prototype; > > Here is the full code for our extend function: > > Inheritance_Manager.extend = function(subClass, baseClass) { > function inheritance() { } > inheritance.prototype = baseClass.prototype; > subClass.prototype = new inheritance(); > subClass.prototype.constructor = subClass; > subClass.baseConstructor = baseClass; > subClass.superClass = baseClass.prototype; > } > > Now that we have implemented our inheritance, we can start using it to > extend our classes. In this case we are going to > extend our Person class into a Manager class as follows: > > We define the Manager class > > Manager = function(id, name, age, salary) { > Person.baseConstructor.call(this, id, name, age); > this.salary = salary; > alert('A manager has been registered.'); > } > > we make it inherit form Person > > Inheritance_Manager.extend(Manager, Person); > > If you noticed, we have just called the extend method of our > Inheritance_Manager class and passed the subClass Manager in our case > and then the baseClass Person. Note that the order is very important > here. If you swap them, the inheritance > will not work as you intended if at all. > Also note that you will need to specify this inheritance before you > can actually define our subClass. > Now let us define our subClass: > > We can add more methods as the one below. Our Manager class will > always have the methods and properties defined in the Person class > because it inherits from it. > > Manager.prototype.lead = function(){ > alert('I am a good leader'); > } > > Now to test it let us create two objects, one from the class Person > and one from the inherited class Manager: > > var p = new Person(1, 'Joe Tester', 26); > var pm = new Manager(1, 'Joe Tester', 26, '20.000'); > > Feel free to get full code and more comments at: > http://www.cyberminds.co.uk/blog/articles/how-to-implement-javascript-inheritance.aspx > > -- > To view archived discussions from the original JSMentors Mailman list: > http://www.mail-archive.com/[email protected]/ > > To search via a non-Google archive, visit here: > http://www.mail-archive.com/[email protected]/ > > To unsubscribe from this group, send email to > [email protected] > > > > -- > Nick Morgan > http://skilldrick.co.uk > @skilldrick > > Save our in-boxes! http://emailcharter.org > -- > To view archived discussions from the original JSMentors Mailman list: > http://www.mail-archive.com/[email protected]/ > > To search via a non-Google archive, visit here: > http://www.mail-archive.com/[email protected]/ > > To unsubscribe from this group, send email to > [email protected] -- To view archived discussions from the original JSMentors Mailman list: http://www.mail-archive.com/[email protected]/ To search via a non-Google archive, visit here: http://www.mail-archive.com/[email protected]/ To unsubscribe from this group, send email to [email protected]
