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Javascript closures and Inheritance
//---------------------BaseClass.js----------------------------

(function () {
    BaseClass= function() { };
    BaseClass.prototype.getTestVar = function() {
    return 'base test variable';
    };
})();


//----------------DerivedClass.js----------------------------

(function () {
    DerivedClass= function() { };
    DerivedClass.inherits(BaseClass);
    DerivedClass.prototype = new BaseClass();
    DerivedClass.prototype = {
        newvar : 'derived func variable ',
        getNewVar : function() { return this.newvar; }
    };
})();

var dc = new DerivedClass();
alert(
    'The value in newvar of derived class ' + dc.getNewVar() +
    ' base class variable ' + dc.getTestVar()
);

DerivedClass.prototype = new BaseClass();
DerivedClass.prototype = {
    newvar : 'derived func variable ',
    getNewVar : function() { return this.newvar; }
};

DerivedClass.prototype = new BaseClass();
DerivedClass.prototype.newvar = 'derived func variable ';
DerivedClass.prototype.getNewVar = function() { return this.newvar; };

DerivedClass.prototype = new BaseClass();
DerivedClass.prototype = {
    newvar : 'derived func variable ',
    getNewVar : function() { return this.newvar; }
};

DerivedClass.prototype = new BaseClass();
DerivedClass.prototype.newvar = 'derived func variable';
DerivedClass.prototype.getNewVar = function() { return this.newvar; }

DerivedClass.method('getNewVar', function () { return this.newvar });