Credo.Check.Refactor.Nesting (Credo v1.5.0) View Source

This check has a base priority of 0 and works with any version of Elixir.

Explanation

Code should not be nested more than once inside a function.

defmodule CredoSampleModule do
  def some_function(parameter1, parameter2) do
    Enum.reduce(var1, list, fn({_hash, nodes}, list) ->
      filenames = nodes |> Enum.map(&(&1.filename))

      Enum.reduce(list, [], fn(item, acc) ->
        if item.filename do
          item               # <-- this is nested 3 levels deep
        end
        acc ++ [item]
      end)
    end)
  end
end

At this point it might be a good idea to refactor the code to separate the different loops and conditions.

Configuration parameters

Use the following parameters to configure this check:

• max_nesting: The maximum number of levels code should be nested.

  Defaults to 2

Like with all checks, general params can be applied.

Parameters can be configured via the .credo.exs config file.