From: "Shot (Piotr Szotkowski)" <shot@...>
Date: 2009-03-30T01:05:10+09:00
Subject: Is there an idiom for mass-populating Hash keys?

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Hello, good folk of ruby-talk.

I was wondering whether there=E2=80=99s a Ruby
idiom to mass-populate keys of a Hash.

I=E2=80=99m coding a graph class supporting labeled vertices, and I want to=
=20
represent this relationship as a @vertices Hash, with keys being the=20
actual vertices and values being their labels =E2=80=93 initially all nil:

class Graph
  def initialize enum
    @vertices =3D {}
    enum.each { |vertex| @vertices[vertex] =3D nil }
  end
end

Is there a more elegant way to take an enum
and turn it into nil-referencing Hash keys?

=E2=80=94 Shot
--=20
>> The Ruby community should proceed with all deliberate
>> speed towards ISO standardization of the language.
> Yeah, look what it did to Forth.
Don=E2=80=99t just say it, show it. http://vividpicture.com/aleks/atari/for=
th.jpg
        [M. Edward (Ed) Borasky, Matt Lawrence, Gregory Brown, ruby-talk]

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