Enum.map_reduce (mis) understanding?

[Alex Shneyderman]

Hi, all!

What am I doing wrong? 

iex(19)> [:html, :txt] |> Enum.map_reduce Map.new,

...(19)>    fn(r, acc) -> acc |> Dict.put r, r end

** (MatchError) no match of right hand side value: %{html: :html}

    (elixir) lib/enum.ex:1036: Enum."-map_reduce/3-lists^mapfoldl/2-0-"/3

Cheers,

Alex.

[Alex Shneyderman]

never mind. a case rtfm, sorry.

[Alex Shneyderman]

actually reading the spec it seems to be a bit inaccurate (hence my confusion). Should not this

• map_reduce(t, any, (element, any -> any)) :: any

be something like this:

• map_reduce(t, any, (element, any -> {any,any})) :: {any, any}

?

I realize that {any,any} is still any but the function is very specific about returning a tuple, so it might be a little more clear to have that in the spec. Unless I am missing something obvious about the specs.

[José Valim]

Yes, you are right. :) an issue or pull request is appreciated :)

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José Valim

www.plataformatec.com.br

Skype: jv.ptec

Founder and Lead Developer