Is there a reason you are not using List.foldl/3? List.foldl list, [], (fn elem, acc -> [f(x) | acc] end)
Can I ask why you are reversing a list, traversing it, just to reverse it again? ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Sunday, 31 March 2019 11:58, Robert Dober <[email protected]> wrote: > Hi there > > I do this all the time, travering a reversed list and accumulating a > transformation into a new list, unreversed now. > > Is this not a very frequent FP pattern. > > I would quite happy to use `Enum.reverse_map` which would be more efficent > than my eternal internal remimplementation: > > ```elixir > > defp map_reverse(collection, fun) do > _map_reverse(collection, fun, []) > end > > defp _map_reverse(collection, fun, result) > defp _map_reverse([], _, result) do > result > end > defp _map_reverse([head|rest], fun, result) do > _map_reverse(rest, fun, [fun.(head)|result]) > end > ``` > > Any thoughts? > > KR > Robert > > -- > You received this message because you are subscribed to the Google Groups > "elixir-lang-core" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elixir-lang-core/a4fe903e-9661-448e-ba80-0b8cfc4f8bff%40googlegroups.com](https://groups.google.com/d/msgid/elixir-lang-core/a4fe903e-9661-448e-ba80-0b8cfc4f8bff%40googlegroups.com?utm_medium=email&utm_source=footer). > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "elixir-lang-core" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elixir-lang-core/2EnP_1aGY4v5K8ZXMJqL8zuTgVP44FLKVnOIEDi1lMmjFaCEot_5CulHgsylJkTkgAWrYEPWNGWciN8nfc3ZeldoLcsm8lWSPecYdGx4Z1s%3D%40protonmail.com. For more options, visit https://groups.google.com/d/optout.
