Javascript extends class

Question

What is the right / best way to extend the javascript class so that class B inherits everything from class A (class B extends A)?

Answer 1

Take a look at Simple JavaScript Inheritance and JavaScript Template Inheritance .

The simplest method is probably functional inheritance, but there are pros and cons.

Answer 2

Douglas Crockford has very good explanations for JavaScript inheritance:

• prototype inheritance : a "natural" way to do something in JavaScript
• classic inheritance : closer to what you find in most OO languages, but it seems to work against JavaScript texture.

Answer 3

extend = function(destination, source) { for (var property in source) { destination[property] = source[property]; } return destination; }; 

JavaScript extension

You can also add filters to the for loop.