Return statement in Elixir

Question

I need a function with some kind of a step-by-step logic and I wonder how I can make one. Let\'s take a log in process on a site as an example, so I need the following logic

Answer 1

I missed return so much that I wrote a hex package called return.

The repository is hosted at https://github.com/Aetherus/return.

Here is the source code for v0.0.1:

defmodule Return do
  defmacro func(signature, do: block) do
    quote do
      def unquote(signature) do
        try do
          unquote(block)
        catch
          {:return, value} -> value
        end
      end
    end
  end

  defmacro funcp(signature, do: block) do
    quote do
      defp unquote(signature) do
        try do
          unquote(block)
        catch
          {:return, value} -> value
        end
      end
    end
  end

  defmacro return(expr) do
    quote do
      throw {:return, unquote(expr)}
    end
  end

end

The macros can be used like

defmodule MyModule do
  require Return
  import  Return

  # public function
  func x(p1, p2) do
    if p1 == p2, do: return 0
    # heavy logic here ...
  end

  # private function
  funcp a(b, c) do
    # you can use return here too
  end
end

Guards are also supported.