- [config_dir, psql_dir, static_dir, uploads_dir]
- |> Enum.reject(&File.exists?/1)
- |> Enum.map(&File.mkdir_p!/1)
+ to_create =
+ [config_dir, psql_dir, static_dir, uploads_dir]
+ |> Enum.reject(&File.exists?/1)
+
+ for dir <- to_create do
+ File.mkdir_p!(dir)
+ end