From: Josh Cheek <josh.cheek@...>
Date: 2010-10-26T23:28:33+09:00
Subject: Re: embedded hash in array to selected-array

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On Tue, Oct 26, 2010 at 8:55 AM, Kar=E1csony K. <koli14@gmail.com> wrote:

> Hi!
>
> I have this array:
> users =3D [ { :id =3D> 1, :name =3D> 'Stephan'}, { :id =3D> 2, :name =3D>
> 'Carol'}, { :id =3D> 3, :name =3D> 'Lizi'} ]
>
> How can i make a users_names, which will contain ['Stephan', 'Carol',
> 'Lizi'] ?
> Thanks:Koli
>
> --
> Posted via http://www.ruby-forum.com/.
>
>
It seems you are using hashes to collect related data. If its just a quick
one time use, a struct might be easier to work with. If you want something
more robust, perhaps a class.


User =3D Struct.new(:id ,:name)
users =3D [ User.new(1,'Stephan') , User.new(2,'Carol') , User.new(3,'Lizi'=
) ]
users # =3D> [#<struct User id=3D1, name=3D"Stephan">, #<struct User id=3D2=
,
name=3D"Carol">, #<struct User id=3D3, name=3D"Lizi">]
users.map { |user| user.name } # =3D> ["Stephan", "Carol", "Lizi"]
users.map { |user| user.id   }   # =3D> [1, 2, 3]

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