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Implement Inheritance in NodeJs

I'm learning Nodejs these days , and coming from an OOP background, i tend to get things done closer to how i'm doing there.

So I wanted all my Nodejs objects to inherit from a base object , that provide utilities common to every other thing .. this is in OOP known as inheritance.

In JavaScript world class/inheritance isn't officially a feature of the language, but its doable, for example the following JavaScript method copies the prototype of one object to another,

function inherit (parent, descendant) {
                var sConstructor = parent.toString();
		var aMatch = sConstructor.match(/\s*function (.*)\(/);
		if(aMatch != null) {
			descendant.prototype[aMatch[1]] = parent;
		}
		for(var m in parent.prototype) {
			descendant.prototype[m] = parent.prototype[m];
		}

The result of this method is, all functions implemented by the parent will now be added to the descendant.

Fine so far, now how to get this done in Nodejs.

NodeJs combine/organize code into what so called "Modules" , and each module should export (the term used by Nodejs) an object that reference the methods defined in the module.

So for example, we will have a module named "baseObject" defined as follows :

var util = require('util');
var base = function() {}

base.prototype = {
	asString : function() {
		return util.inspect(this, true, null);
	}
}
module.exports = base;

 This module defined an object called base, that have a single method called "asString()" which simply dumps a string representation of the object using Nodejs "util.inspect" method , and we export this object .

And we have another object called "settings" that also needs to define a method "asString()" to dump the string representation of that object , defiantly the proper way to do this in Java is to have "settings" inherit from "base" , but how to do so in Nodejs , here is how :

var obj = require("./utils/objectUtils.js");// Defines "inherit" method
var base = require("./utils/baseObject.js");// Holds "asString()" method that we want "settings" to inherit it.
var settings = function() {
	this.x=1;
        this.y=2
}
// Inheirt from the base object 
obj.inherit(base,settings);
module.exports = new settings();

So what did we do is , before we export the module , we called the method "inherit" to copy the prototype of "base" class into "settings" class.

This will result having the following code simply works :

var settings=require('./settings.js');
console.log(settings.asString());

7 Free E-Books and Tutorials for Learning and Mastering Node.js

7 Free E-Books and Tutorials for Learning and Mastering Node.js

The Node Beginner Book » A comprehensive Node.js tutorial

The Node Beginner Book » A comprehensive Node.js tutorial

Nagstamon : Nagios Windows Desktop Integration/ Status Monitor Utility

Nagstamon is a utility that sets at your system tray in Windows listening for your Nagios alerts , incredibly helpful if you don't want to set looking at your Email all the time.

http://nagstamon.ifw-dresden.de/

Getting full process name in Linux

"ps: commands doesn't display the full name of the process with command line run arguments to get over this you can either :

1- Get it from  /proc//cmdline
2- using either htop (required to be installed) , and scroll horizontally.

Fixing "Your system or network configuration does not allow Drupal to access web pages" on Windows

I've installed Durpal for the first time today , and the status report was showing this message

"Your system or network configuration does not allow Drupal to access web pages"

Fixing that requires editing /system32/drivers/etc/hosts to like :


# localhost name resolution is handled within DNS itself.
127.0.0.1       localhost
# ::1             localhost

The default was


# localhost name resolution is handled within DNS itself.
# 127.0.0.1       localhost
# ::1             localhost

This also caused the website to sped up dramatically .

For more possible solutions check out

http://drupal.org/node/222454

What is the difference between Git Commit and Git Push

Git Commit , is used to push your changes to your local repository.

Git Push, is used to push changes from your local repository to the remote repositories.

For more understand read,

git ready » pushing and pulling