From: Dark Ambient <sambient@...>
Date: 2006-06-27T00:20:00+09:00
Subject: Re: Stumped:beginners question

Well, now the author has introduced us to the wonderful world of
recursion.  Removes the need for the loop. I imagine very useful in
various situations.

Stuart

On 6/25/06, dblack@wobblini.net <dblack@wobblini.net> wrote:
> Hi --
>
> On Mon, 26 Jun 2006, Cliff Cyphers wrote:
>
> > On Mon, Jun 26, 2006 at 08:57:05AM +0900, Pete Yandell wrote:
> >> I'm just going to rewrite this, because there are a bunch of bad
> >> things in it.
> >>
> >> def ask(question)
> >>   response_is_valid = false
> >>   result = false
> >>   while !response_is_valid
> >>     puts question
> >>     reply = gets.chomp.downcase
> >>     case reply
> >>       when 'yes'
> >>         result = true
> >>         response_is_valid = true
> >>       when 'no'
> >>         result = false
> >>         response_is_valid = false
> >>       else
> >>         puts 'Please answer "yes" or "no".'
> >>     end
> >>   end
> >>   result
> >> end
> >>
> >
> > much simpler than using the case statement:
> >
> > def ask(question)
> >  puts question
> >  reply = gets.strip.downcase
> >  while ("#{reply}" != "yes") && ("#{reply}" != "no")
>
> You're working too hard :-)  No need to do string interpolation:
>
>    while (reply != "yes") && (reply != "no")
>
> or even:
>
>    until %w{ yes no }.include?(reply)
>
>
> David
>
> --
> David A. Black (dblack@wobblini.net)
> Ruby Power and Light, LLC (http://www.rubypowerandlight.com)
>
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