From: Bill Atkins <batkins57@...>
Date: 2005-04-22T23:57:04+09:00
Subject: Re: [QUIZ] HighLine (#29)

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Disregard. :)

On 4/22/05, Bill Atkins <batkins57@gmail.com> wrote:
>=20
> Is using a class instead of a module allowed?
>=20
> On 4/22/05, Ruby Quiz <james@grayproductions.net> wrote:=20
> >=20
> > The three rules of Ruby Quiz:
> >=20
> > 1. Please do not post any solutions or spoiler discussion for this quiz=
=20
> > until=20
> > 48 hours have passed from the time on this message.
> >=20
> > 2. Support Ruby Quiz by submitting ideas as often as you can:
> >=20
> > http://www.rubyquiz.com/
> >=20
> > 3. Enjoy!
> >=20
> >=20
> > -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=
=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D=
-=3D-=3D-=3D-=3D
> >=20
> > When you stop and think about it, methods like gets(), while handy, are=
=20
> > still
> > pretty low level. In running Ruby Quiz I'm always seeing solutions with=
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> > helper=20
> > methods similar to this:
> >=20
> > # by Markus Koenig
> >=20
> > def ask(prompt)
> > loop do
> > print prompt, ' '
> > $stdout.flush
> > s =3D gets
> > exit if s =3D=3D nil
> > s.chomp!
> > if s =3D=3D 'y' or s =3D=3D 'yes'
> > return true
> > elsif s =3D=3D 'n' or s =3D=3D 'no'
> > return false
> > else
> > $stderr.puts "Please answer yes or no."
> > end
> > end
> > end
> >=20
> > Surely we can make something like that better! We don't always need=20
> > Rails or a
> > GUI framework and there's no reason writing a command-line application=
=20
> > can't be=20
> > equally smooth.
> >=20
> > This week's Ruby Quiz is to start a module called HighLine (for=20
> > high-level,
> > line-oriented interface). Ideally this module would eventually cover=20
> > many
> > aspects of terminal interaction, but for this quiz we'll just focus on=
=20
> > getting=20
> > input.
> >=20
> > What I really think we need here is to take a page out of the optparse=
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> > book.
> > Here are some general ideas:
> >=20
> > age =3D ask("What is your age?", Integer, :within =3D> 0..105)
> > num =3D eval "0b#{ ask( 'Enter a binary number.',=20
> > String, :validate =3D> /^[01_]+$/ ) }"
> >=20
> > if ask_if("Would you like to continue?") # ...
> >=20
> > None of these ideas are etched in stone. Feel free to call your input=
=20
> > method
> > prompt() or use a set of classes. Rework the interface any way you like=
.=20
> > Just=20
> > be sure to tell us how to use your system.
> >=20
> > The goal is to provide an easy-to-use, yet robust method of requesting=
=20
> > input.
> > It should free the programmer of common concerns like calls to chomp()=
=20
> > and
> > ensuring valid input.=20
> >=20
> >=20
>=20
>=20
> --=20
> Bill Atkins=20




--=20
Bill Atkins

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