Example Code for Presentation

immutable.ex

user = Repo.get(User, id)
updated_user = 
  user
  |> &increment_login_attempts
  |> &Repo.update

IO.inspect user # login_attempts = 0
IO.inspect updated_user # login_attempts = 1

more_immutable.ex

Repo.get(User, id)
  |> &increment_login_attempts
  |> &Repo.update

mutable.java

User user = UserDao.findById(id);
user.incrementLoginAttempts();
User updatedUser = UserDao.update(user);

System.out.println(user == updatedUser); // who knows?

parallelized.ex

user = Repo.get(User, id)

# splits off asynchronously
Task.async(fn -> user |> &submit_data_to_tracker end)

result = delete_everything(user) # will never interfere with async process above