NodeJS defineClass - nested classes

Question

NodeJS defineClass - nested classes

First of all, I'm quite new to both OOP and NodeJS. My only experience with classes so far, are in PHP.

I'm trying to make a javascript class called Clients, using the defineClass module in NPM. Then I want to add sub-classes to it, with even more functionality. The reason I want some of the functionality in sub-classes, is because some of them might have quite alot of functionality.

Here is my code:

var defineClass = require("defineClass").defineClass

var Client = defineClass({
  scpConnected: false,

  constructor: function (socketId) {
    this.id = socketId;
  },

  test: function (test){
    console.log('Test!!! '+ test); 
  }
});

var SSH = defineClass({
  _super: Client,
  connected: false,
  busy: false,
  buffer: '',

  constructor: function () {
    queue = [];
  },

  ssh: {
    connect: function (IP) {
      console.log('Connecting to '+ IP +'...');
    }
  }
});

var client = new Client('Test');
client.ssh.connect();

It seems like "client" doesn't get the SSH abilities as I was expecting.

What am I doing wrong here? :)

New Code

var defineClass = require("defineClass").defineClass

var Client = defineClass({
  scpConnected: false,

  constructor: function (socketId) {
    this.id = socketId;
  },

  test: function (test){
    console.log('Test!!! '+ test); 
  },

  SSH: defineClass({  
      connected: false,
      busy: false,
      buffer: '',

      constructor: function () {
        queue = [];
      },

      connect: function (IP) {
        console.log('Connecting to '+ IP +'...');
      }
    })
});

var client = new Client('Test');
client.SSH.connect('test');

oop
node.js

Answer 1

As I can see in your sample, you are actually creating instance of Client instead of SSH:

 var client = new Client('Test');
 client.ssh.connect();

You should write:

 var client = new SSH('Test');
 client.ssh.connect();

Note that parent class doesn't have the functionality of its children, it's against the idea of inheritance.

Answer 2

There are clearly some problems with inheritance.

Consider the following example (corresponding to your code) in PHP:

<?php

class Client {
    public function __construct($socketId) {
        $this->id = $socketId;
    }
}

class SSH extends Client {
    public function __construct() {
        $this->queue = new Array();
    }

    public $ssh = "whatever";
}

$client = new Client('Test');
//What is the $client->ssh now?

?>