This check has a base priority of high and requires Elixir < 1.8.0.

Explanation

Enum.into/3 is more efficient than Enum.map/2 |> Enum.into/2.

This should be refactored:

[:apple, :banana, :carrot]
|> Enum.map(&({&1, to_string(&1)}))
|> Enum.into(%{})

to look like this:

Enum.into([:apple, :banana, :carrot], %{}, &({&1, to_string(&1)}))

The reason for this is performance, because the separate calls to Enum.map/2 and Enum.into/2 require two iterations whereas Enum.into/3 only requires one.

Configuration parameters

There are no parameters for this check.