I don't really agree that it makes the intent clearer. It combines two distinct and unrelated activities. One takes the sum of a list, the other maps each value in a list to some other value. list |> Enum.map(& &1 * 2) |> Enum.sum expresses this perfectly. If you're going for lolspeed and need to avoid the second pass then you want a bare recursive function anyway and shouldn't even use Enum.
On Saturday, December 1, 2018 at 11:18:58 AM UTC-5, Sean Handley wrote: > > Hello, > > I'd like to propose *Enum.sum/2*, where the second argument is a function. > > This will allow writing > > Enum.sum([1, 2, 3], &(&1 * 2)) > > instead of > > Enum.map([1,2,3], &(&1 * 2)) |> Enum.sum() > > The advantages are: > > - Write less code. > - One few iteration across the collection. > > I have a branch prepared - > https://github.com/elixir-lang/elixir/compare/master...seanhandley:map_with_func > > Please let me know your thoughts. > > Cheers, > Sean > > -- 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 elixir-lang-core+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elixir-lang-core/fb7ab97c-3b0d-4772-9525-617cc765414a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
