parameter_coupling.js

//coupled
function main(userInputtedString, userInputtedBoolean, userInputtedInt){
  
  var car = new Vehicle();
  var bus = new Vehicle();
  var plane = new Vehicle();
  
  var vehicles = [car,bus,plane];
  
  forEach(vehicle in vehicles){
     vehicle.updateSomeStuff(userInputtedString);
     vehicle.updateSomeOtherStuff(userInputtedBoolean,userInputtedInt);
  }
  
}

//decoupling step 1 : Inverting Dependencies (IOC)
function main(userInputtedString, userInputtedBoolean, userInputtedInt){
  
  var options = new UserOptions(userInputtedString,userInputtedBoolean,userInputtedInt);
  
  var car = new Vehicle(options);    // --> inverted here
  var bus = new Vehicle(options);    // --> inverted here
  var plane = new Vehicle(options);  // --> inverted here
  
  var vehicles = [car,bus,plane];
  
  forEach(vehicle in vehicles){
     vehicle.update();// <-- decoupled here
  }
  
}


//decoupling step 2 : Using An IOC/DI Container
function main(UserOptions,userInputtedString,userInputtedBoolean,userInputtedInt){
  
  UserOptions.setUserOptions(userInputtedString,userInputtedBoolean,userInputtedInt); // --> dependency injected not 'newed'
  
  var car = new Vehicle();   // --> decoupled here
  var bus = new Vehicle();   // --> decoupled here
  var plane = new Vehicle(); // --> decoupled here
  
  var vehicles = [car,bus,plane];
  
  forEach(vehicle in vehicles){
     vehicle.update();
  }
  
}

//decoupling step 3 : Further Decoupling
function main(UserOptions, VehicleFactory, Vehicleupdater, UserParams){
  
  userOptions.setUserOptions(UserParams.captureInputteParams());  // <-- decoupled here
  
  vehicleupdater.updateVehicles(vehicleFactory.load());  // <-- decoupled here
  
}

//decoupling step 4 : 99% decoupled
function main(VehicleFacade){
  
  VehicleFacade.update(); // <-- our enire app is now hidden from the main method
  
}