jQueryExtend.js

// #1 - Define the master library
var TMA = {
  ModuleOne: {
    importantNumber: 2,
    doSomething: function() {
      return importantNumber+2;
    }
  },
  ModuleTwo: {
    someProperty: true,
    someFunction: function() {
      return false;
    }
  }
};
var firstResult = TMA.ModuleOne.doSomething(); // ----> 4

// #2 - Extend the master library, using 'aspect-oriented' strategies if necessary
var oldDoSomething = TMA.ModuleOne.doSomething;
jQuery.extend(TMA.ModuleOne,{
  doSomething: function() {
    var result = oldDoSomething();
    return result+2;
  }
});
var secondResult = TMA.ModuleOne.doSomething(); // ----> 6