View Source Credo.Check.Refactor.MapInto (Credo v1.7.2-rc.4)
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.
NOTE: This check is only available in Elixir < 1.8 since performance improvements have since made this check obsolete.
Check-Specific Parameters
There are no specific parameters for this check.
General Parameters
Like with all checks, general params can be applied.
Parameters can be configured via the .credo.exs
config file.