From: Craig Demyanovich <cdemyanovich@...>
Date: 2008-02-26T23:41:25+09:00
Subject: Re: Array help needed

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On Tue, Feb 26, 2008 at 9:36 AM, Jano Svitok <jan.svitok@gmail.com> wrote:

> On Tue, Feb 26, 2008 at 3:20 PM, Zouplaz <user@domain.invalid> wrote:
> > Hello, sorry if this question is stupid but I can't find a solution
> >  after several readings about Arrays
> >
> >  Array 'a' contains several objets (ruby classes instances), each
> >  instance have an id property
> >
> >
> >  I need a clean solution to return true if array 'a' contains an
> instance
> >  with id foo without iterating the whole array.
> >
> >  Example
> >
> >  def add_user(user)
> -    unless users.include?(user.id)
> + unless users.any? {|u| user.id == u.id }
> >      users << user
> >    end
> >  end


If you can't do this

def add_user(user)
  unless users.include?(user) # just check the user instead of the id
    users << user
  end
end

then I'd also recommend Jano's solution.

Regards,
Craig

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