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Basic classical inheritance system


Nuclei provides you with an Object Oriented inheritance system allowing you to straightforwardly create classes, while maintaining standard prototype functionality.


Download the package through npm:

npm install nuclei


Require Nuclei, the base class from which all others inherit:

var Nuclei = require('nuclei').Nuclei;

Class Properties

Every class has a few properties you can use:

extend method

In order to create a new class, you need to use the extend method, like this:

Nuclei.extend([ClassName], NewClassConstructor, [OptionsObject]);
  • ClassName: A string containing the name of the class you wish to extend. Optional, because each class has its own extend method.

  • NewClassConstructor: A named function containing all the methods for this class. These methods should be assigned to the this variable, and should also be named! This function will be executed immediately and will not be re-executed upon instancing a new object. So anything in here will be shared by all instances.

  • OptionsObject: An optional object containing special configuration. Mostly used by internal Nuclei stuff.

    • also: A class (or array of classes) for multiple inheritance. Especially useful for non-nuclei classes, like EventEmitter.

overload method

This is basically the same as extending the class, but it is used to overwrite the class you're extending.

You can even overload a class that does not exist yet.

Nuclei.overload([ClassName], NewClassConstructor);
  • ClassName: A string containing the name of the class you wish to overload. Optional. If the class does not exist yet, it will be overloaded once it does. Warning: Does not affect already existing instances.

  • NewClassConstructor: Same as the extend method parameter.

parent property

The parent property of the class is a reference to its parent class.

Class Instance Magic Methods

Every instance has a bit of magic:

  • init: This is the 'constructor' method. It will receive all the parameters passed at instancing.

  • __extended__: This method runs when the class is being extended. This runs outside of any instance, but it still has access to 'parent()'.

  • augment: This method creates an 'augmented' version of the current instance. You can read more about this in the 'augmentation' section.

  • augmented: This method runs after the instance has been augmented.

  • parent: The parent method calls a method from the parent class. More can be read in the 'parent' section.

Create a new class

You can create a basic class by using the extend method in this way:

var Animal = Nuclei.extend(function Animal() {
    this.init = function init() {
        console.log('Animal has been inited');
    this.speak = function speak() {
        console.log('What does a generic animal say?');
var myAnimal = new Animal();
// >>> "Animal has been inited" 
// >>> "What does a generic animal say?" 

Extend a class

This is basically the same as creating a new class, since creating a new class is actually extending from the Nuclei base class.

var Dog = Animal.extend(function Dog() {
    this.init = function init(color) {
        this.color = color;
        console.log('Dog has been inited');
    this.speak = function speak() {
        console.log('The ' + this.color + ' dog says: woef!');
var myDog = new Dog();
// >>> "Dog has been inited" 
// >>> "Animal has been inited" 
// >>> "The brown dog says: woef!" 

Augmenting an instance

In certain cases it could be wasteful to create a new instance of a class. Instead you can augment the instance, which basically creates a new context for the instance and uses that.

var myAugmentedDog = myDog.augment({color: 'augmented'});
// >>> "The augmented dog says: woef!" 


You can call a parent method in several ways inside a method:

  • this.parent() calls the parent of the current method, passing the same arguments
  • this.parent(name) calls the name method of the parent class, passing the same arguments
  • this.parent(name, [arg1, arg2]) calls the name method of the parent class, passing the arguments inside the array as parameters
  • this.parent(name, null, arg1, arg2, arg3) calls the name method of the parent class, passing the extra arguments as parameters


The prototype system can still be used to add methods to already existing classes. You can also use the parent method inside it.

All children classes will also be able to access this new method, even after instancing.

Animal.prototype.newlyAddedMethod = function newlyAddedMethod(){