obj.js

function prop(obj, name, get, set) {
  var base= name.substr(0,1).toUpperCase() + name.substr(1);

  if(!get) {
    get= function() {
      return this['_' + name];
    };
  }
  if(!set) {
    set= function(v) {
      this['_' + name]= v;
      return this;
    };
  }
  obj.prototype[name]= function(v) {
    if(v === undefined) {
      return this['get' + base]();
    }
    return this['set' + base](v);
  };
  obj.prototype['get' + base]= get;
  obj.prototype['set' + base]= set;
}

function emptyFunc() {
}

module.exports= function(obj) {
  if(obj === undefined) obj= function() {};
  var me= {
    Prop: function(name, get, set) {
      prop(obj, name, get, set);
      return me;
    }, 

    GetProp: function(name, get) {
      prop(obj, name, get, emptyFunc);
      return me;      
    },

    SetProp: function(name, set) {
      prop(obj, name, emptyFunc, set);
      return me;      
    },

    Constructor: function() {
      return function() {
        if(false === (this instanceof obj)) {
          return new obj();
        }
        return obj();
      };
    },

    Prototype: obj.prototype
  };

  return me;
};