Hi Paul, You got the bug backwards. The issue is that flat_map continues even after take(1). Streams are by design meant to halt when items will no longer be consumed.
I will investigate it soon. PS: I will send an email that retires this mailing list later today. On Saturday, September 10, 2016, Paul Balomiri <paulbalom...@gmail.com> wrote: > Hi, > > Today i banged my head against this one : > > iex(13)> [[true,false],[false],[true]]|>Stream.filter(fn([x|tail])-> > IO.inspect([filter: x]); x end) |>Stream.take(1) |> Stream.flat_map(fn(x)-> > IO.inspect([flat_map: x]); x end) |> Enum.to_list() > [filter: true] > [flat_map: [true, false]] > [filter: false] > [filter: true] > [true, false] > > > taking away the culprit `Stream.flat_map` prevents the execution of > `Stream.filter`'s function after the first element: > [[true,false],[false],[true]]|>Stream.filter(fn([x|tail])-> > IO.inspect([filter: x]); x end) |>Stream.take(1) |> Enum.to_list() > [filter: true] > [[true, false]] > > It seems to me that this is a bug, but what i find more puzzling is that i > do not know how `Stream.flat_map` has even any influence on the > `Stream.filter` function. > > Did i miss here how `Stream.flat_map` should work or shall file a bug > request? > > Paul > > -- > You received this message because you are subscribed to the Google Groups > "elixir-lang-talk" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to elixir-lang-talk+unsubscr...@googlegroups.com > <javascript:_e(%7B%7D,'cvml','elixir-lang-talk%2bunsubscr...@googlegroups.com');> > . > To view this discussion on the web visit https://groups.google.com/d/ > msgid/elixir-lang-talk/ed614aa7-8c44-490d-90d4- > 7ff563dc9dc9%40googlegroups.com > <https://groups.google.com/d/msgid/elixir-lang-talk/ed614aa7-8c44-490d-90d4-7ff563dc9dc9%40googlegroups.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- *José Valim* www.plataformatec.com.br Skype: jv.ptec Founder and Director of R&D -- You received this message because you are subscribed to the Google Groups "elixir-lang-talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to elixir-lang-talk+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/elixir-lang-talk/CAGnRm4KPJCXtO7gKCVRb5T4t1iOhrUzJoT6saz1OZ%3DXuqo3uzw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
