main.go

func get(w http.ResponseWriter, r *http.Request) *HTTPError {
  // get some logged in user
  user := GetUserFromContext(r)
  // create error and result channel
  errchan := make(chan error, 2)
  friendsChan := make(chan []Friend)
  CarsChan := make(chan []Cars)
  // get friends
  go func() {
    friends, err := db.GetFriends(user.Name)
    if err != nil {
      errchan <- err
      return
    }
    friendsChan <- friends
  }()
  // get cars
  go func() {
    cars, err := db.GetCars(user.Name)
    if err != nil {
      errchan <- err
      return
    }
    carsChan <- cars
  }()
  // define vars here
  var friends []Friend
  var cars []Car
  // collect results from channels
  for i:=0; i<2; i++ {
    select {
    case err := <- errchan:
      return &HTTPError{err}
    case friends = <- friendsChan:
    case cars = <- carsChan:
      // just assign the result from the channel so they can be used in the template
    }
  }
  // use `friends` and `cars` to render html template
}