Prestwood IT: JavaScript Inheritance (No, but sort of.) (JavaScript and AJAX)

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From the August 2014 Issue of Prestwood eMag

JavaScript and AJAX:

JavaScript Inheritance (No, but sort of.)

By Mike Prestwood

Posted 17 years ago on 10/23/2008 and updated 1/23/2009

JavaScript Code Snippet:

To/From Code Guide: JavaScript Inheritan... vs. Other Languages

A flashcard from our JavaScript Flashcards Library

A code snippet from our JavaScript Code Snippets Page

Tags: JavaScript , Inheritance

KB101393

General Info: Inheritance

The concept of a class makes it possible to define subclasses that share some or all of the main class characteristics. This is called inheritance. Inheritance also allows you to reuse code more efficiently. In a class tree, inheritance is used to design classes vertically. (You can use Interfaces to design classes horizontally within a class tree.) With inheritance, you are defining an "is-a" relationship (i.e. a chow is-a dog). Analysts using UML call this generalization where you generalize specific classes into general parent classes.

JavaScript Inheritance

JavaScript does not offer a formal inheritance machanism. There are some tricks some developers are fond of.

Inheritance
The concept of a class makes it possible to define subclasses that share some or all of the main class characteristics. This is called inheritance. Inheritance also allows you to reuse code more efficiently. In a class tree, inheritance is used to design classes vertically. (You can use Interfaces to design classes horizontally within a class tree.) With inheritance, you are defining an "is-a" relationship (i.e. a chow is-a dog). Analysts using UML call this generalization where you generalize specific classes into general parent classes.

More Info

Definition:

Inheritance

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Code Contributed By Mike Prestwood:

Mike Prestwood is a drummer, an author, and creator of the PrestwoodBoards online community. He is the President & CEO of Prestwood IT Solutions. Prestwood IT provides Coding, Website, and Computer Tech services. Mike has authored 6 computer books and over 1,200 articles. As a drummer, he maintains play-drums.com and has authored 3 drum books. If you have a project you wish to discuss with Mike, you can send him a private message through his PrestwoodBoards home page or call him 9AM to 4PM PST at 916-726-5675 x205.

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