ee-class

Javascript Class implementation for node.js

installation

npm install ee-class

build status

usage

var Class = require( "ee-class" );


var LifeForm = new Class( {
    isAlive: false

    , init: function( options ){
        this.isAlive = !!options.isAlive;
    }
} );



var Human = new Class( {
    inherits: LifeForm
    
    , name: ""

    // pay attention to give the function a name so you can reference it when you are calling the parent function
    , init: function myInitFunction( options ){
        myInitFunction.parent( options );
        this.name = options.name;
    }
} );



var Boy = new Class( {
    inherits: Human

    , age: 0

    // pay attention to give the function a name so you can reference it when you are calling the parent function
    , init: function myInitFunction( options ){
        myInitFunction.parent( options );
        if ( options.age > 18 ) throw new Error( "Too old to be a boy!" )
        this.age = options.age;
    }


    , describe: function(){
        console.log( "Hi, my name is %s, i'm %s years old and i'm " + ( this.isAlive ? "alive :)" : "dead :(" ), this.name, this.age );
    }
} );



var fabian = new Boy( {
      name:     "fabian"
    , age:      15
    , isAlive:  true
} );

fabian.describe(); // Hi, my name is fabian, i'm 15 years old and i'm alive :)

working with propertiy definers

since version 0.2.7 you may pass an object with object property defintions to the class module.

var MyClass = new Class({
    init: function(){

    }
} 
, { 
    _values: {
        value: {
            name: 'john doe'
        }
    }
    , name: {
        get: function(){
            return this._values.name;
        }
        , set: function(newValue){
            this._values.name = newValue;
        }
        , enumerable: true
    }
});

var x = new MyClass();

x.name = 'michael';
console.log(x.name); // michael

Version History

• 0.1.0: initial version
• 0.1.3: fixed integration with eventemitter objects
• 0.2.0: Added proper implementation for calling super functions, deprecated the «parent» property
• 0.2.1: Bugfix for the «super implementation»
• 0.2.2: Deprecated the «super» property and replaced it with the «parent» property beacuse super is a javascript reserved keyword
• 0.2.3: The constructor takes now n instead of 1 arguments
• 0.2.4: The constructor may now return a function when overriding the class implementation
• 0.2.6: Classes expose their defintion now via the «Class.definition» proroperty
• 0.2.7: Added support fo Object.defineProperties()
• 0.2.8: Removed all occurences of proto in th eclass implementation, replaced the by Object.getPrototypeOf()