View Source Credo.Check.Refactor.MapJoin (Credo v1.7.2-rc.4)
This check has a base priority of high
and works with any version of Elixir.
Explanation
Enum.map_join/3
is more efficient than Enum.map/2 |> Enum.join/2
.
This should be refactored:
["a", "b", "c"]
|> Enum.map(&String.upcase/1)
|> Enum.join(", ")
to look like this:
Enum.map_join(["a", "b", "c"], ", ", &String.upcase/1)
The reason for this is performance, because the two separate calls
to Enum.map/2
and Enum.join/2
require two iterations whereas
Enum.map_join/3
performs the same work in one pass.
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.