Javascript extends class [closed]

Question

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

Answer 1

Take a look at Simple JavaScript Inheritance and Inheritance Patterns in JavaScript.

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

Answer 2

Douglas Crockford has some very good explanations of inheritance in JavaScript:

1. prototypal inheritance: the 'natural' way to do things in JavaScript
2. classical inheritance: closer to what you find in most OO languages, but kind of runs against the grain of JavaScript

Answer 3

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

Extending JavaScript

You could also add filters into the for loop.