this post was submitted on 21 Oct 2023
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Elixir

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In a third-party project, in the models, I've encountered functions like this:

  def changeset(model \\ %__MODULE__{}, params) do
    model
    |> cast(params, @required_fields ++ @optional_fields)
    |> validate_required(@required_fields)
  end

How can a function have a default argument which is both a) first and b) followed by a mandatory one?

What's interesting, they work properly.

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[–] [email protected] 1 points 1 year ago

That's interesting. What if you were to call it with only 1 argument? Would that not match, or would it match as the 1st argument is using the default?