What do you mean by not converting to a list? The fastest way right now of doing a map on a map is actually to convert to list, map and convert back to a map. I’d suspect that’s the case with a lot of data structures as well, actually. Lists are simply really good for recursion. The benefit is even greater if you do multiple operations on those lists, as the conversion happens (ideally) only once.
Michał. > On 07 Jul 2016, at 19:35, Peter Hamilton <[email protected]> wrote: > > Does the Enumerable protocol enable the performance improvement of not > converting to a list? I don't think it does. > > > On Thu, Jul 7, 2016, 10:24 AM Andrea Leopardi <[email protected] > <mailto:[email protected]>> wrote: > Enum.into/3 should do what you want :) > > On Thursday, 7 July 2016, Wiebe-Marten Wijnja <[email protected] > <mailto:[email protected]>> wrote: > I propose to add `into: collectable` as optional third argument to Enum.map. > > This would allow mapping over things without first converting it to a list > and then convert it back. > > So: > > %{"a" => 1, "b" => 2} > |> Enum.map(fn {k, v} -> {String.upcase(k), v} end) > |> Enum.into(%{}) > > could be written as: > > %{"a" => 1, "b" => 2} > |> Enum.map(fn {k, v} -> {String.upcase(k), v} end, into: %{}) > > Not having to do the list conversion in the middle might also improve > performance. > > > Right now, enumerating and collecting in one go is of course possible using > `Kernel.SpecialForms.for`. `for` is however not very pipeline-friendly. > > > What do you think? > > > Sincerely, > > ~Wiebe-Marten > > -- > 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/23c345b9-9ba1-48ea-8db0-6d2e9e700473%40googlegroups.com > > <https://groups.google.com/d/msgid/elixir-lang-core/23c345b9-9ba1-48ea-8db0-6d2e9e700473%40googlegroups.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. > > > -- > > Andrea Leopardi > [email protected] <mailto:[email protected]> > > -- > 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] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elixir-lang-core/CAM9Rf%2BLY6tyh%3DE6iM%2BA7rmyY8dKP-ddCJpB%2BWZDn0jCuJ7FKaA%40mail.gmail.com > > <https://groups.google.com/d/msgid/elixir-lang-core/CAM9Rf%2BLY6tyh%3DE6iM%2BA7rmyY8dKP-ddCJpB%2BWZDn0jCuJ7FKaA%40mail.gmail.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout > <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] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/elixir-lang-core/CAOMhEnyR_50BhVdVugiQqDUxY9jUBNRCR23Bao%3DhwQ9Zmeh4PA%40mail.gmail.com > > <https://groups.google.com/d/msgid/elixir-lang-core/CAOMhEnyR_50BhVdVugiQqDUxY9jUBNRCR23Bao%3DhwQ9Zmeh4PA%40mail.gmail.com?utm_medium=email&utm_source=footer>. > For more options, visit https://groups.google.com/d/optout > <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/522D8285-7255-43E9-9494-2E991D54E9E7%40muskala.eu. For more options, visit https://groups.google.com/d/optout.
signature.asc
Description: Message signed with OpenPGP using GPGMail
