How to normalize function params

Questions & Help Questions
1

Hey everyone!

Saša Jurić on his talk called Clarity @ ElixirConf EU 2021, mentions a way of architecting your code that uses a function that he names normalize/2, but sadly, he says he doesn’t have time to share it.

I want to implement this programming style, but I’m missing this key ingredient. Do you know any libraries or gist that accomplish this? Thanks :folded_hands:

def register(conn, params) do
  schema = [
    email: {:string, required: true},
    password: {:string, required: true}
    date_of_birth: :datetime,
    # ...
  ]

  with {:ok, params} <- normalize(params, schema),
    {:ok, user} <- MySystem.register(params) do
    # respond success
  else
  {:error, reason} ->
  # respond error
  end
end

update: if it’s not clear, I’m looking for a way of checking the existence and type of all the fields specified in schema.