Mixin Builder : An example using compositional inheritance to create new functionalities by mixin curations.

app.js

var App = (function () {
  return {
    init : function (modules) {
      for (var moduleIndex = 0, len = modules.length; moduleIndex < len; moduleIndex++) {
        for (var prop in modules[moduleIndex]) {
            modules[moduleIndex][prop]();
         }
      }
    }
  }
})();

init.js

//self-initialized mixin composition function
Vehicle(MixinStore).init()

MessageStore.js

var MessageStore = (function MessageStore () {
   return {
      HOLDING_THE_WHELL : 'holding whell...',
      FIRING_THE_ENGINE : 'firing the engine...',
      FULLING_THE_TANK : 'fulling the tank...',
      HOLDING_THE_STICK : 'holding the stick'
   }
})();

MixinBuilder.js

var MixinBuilder = (function () {
   var mixinCollection = {};
   var create = function (mixins) {
      if (!!mixins) {
         for (var mixinIndex = 0, len = mixins.length; mixinIndex < len; mixinIndex++) {
            for (var attrName in mixins[mixinIndex]) {
               mixinCollection[attrName] = mixins[mixinIndex][attrName]; 
            }  
         }
      }
      return mixinCollection;
   }
   return {
      create : create
   }
})();

MixinStore.js

var MixinStore = (function MixinStore () {
   return function (MessageStore) {
      return {
         driving : {
            holdTheWhell : function () {
               console.log(MessageStore.HOLDING_THE_WHELL);
            },
            fireTheEngine : function () {
               console.log(MessageStore.FIRING_THE_ENGINE);
            },
            fullTheTank : function () {
               console.log(MessageStore.FULLING_THE_TANK);
            }
         },
         cycling : {
            holdTheStick : function () {
               console.log(MessageStore.HOLDING_THE_STICK);
            }
         }
      }  
   }
})();

Vehicle.js

var Vehicle = (function () {
  return function (mixinStore) {
    var self = MixinBuilder.create([mixinStore.driving, mixinStore.cycling]);
    return {
      init : function () {
        self.holdTheWhell(); // logs holding the whell
        self.fireTheEngine(); // logs firing the engine
        self.fullTheTank(); // logs fulling the tank
        self.holdTheStick(); //logs holding the stick
      }
    }
  }
})();