From: Robert Klemme <bob.news@...>
Date: 2004-04-19T17:09:55+09:00
Subject: Re: Hash, ==,  key-value comparison


"Zsban Ambrus" <ambrus@math.bme.hu> schrieb im Newsbeitrag
news:20040418110453.GA2123@math.bme.hu...
> On Sun, Apr 18, 2004 at 07:39:11PM +0900, Robert Klemme wrote:
> >
> > "Zsban Ambrus" <ambrus@math.bme.hu> schrieb im Newsbeitrag
> > news:20040417194736.GA1309@math.bme.hu...
> > > On Fri, Apr 16, 2004 at 09:23:00AM +0900, nobu.nokada@softhome.net
wrote:
> > > > Hi,
> > > >
> > > ..
> > > >
> > > > I feel Hash#=== would test membership, i.e., alias for
> > > > Hash#key?.
> > > >
> > > > -- 
> > > > Nobu Nakada
> > >
> > > I'd agree with that. This way you could easily test for many
possible
> > > values in a case statement.
> >
> > Does this work?  I mean
> >
> > h = {}
> > case h
> >   when val1, val2
> >     ...
> > end
> >
> > Does something else: it tests val1 === h and val2 === h and not h ===
val1.
> > Currently I don't see how Hash#=== can be used in a case to test for
> > multiple values.  In order to use Hash#=== in a case statement, the
hash has
> > to appear in the when clauses.  Do I overlook something?
> >
> > Regards
> >
> >     robert
> >
> >
>
> No, I mean something like this:
>
> bad= {};  # bad magic words that the player might try
> %w[abracadabra xyzzy hocuspocus bringmehome].each do |x| bad[x]=1 end;
> # this list of (bad) magic words might get very long
>
> ...
>
> (in a loop)
> ....
> gets
> ~/^\s*(\w+)/ and word= $1
> case word
>   when bad
>     puts "That won't work in this game.  Nice try, thuogh."
>   when "aardvark" # this is the real magic word
>     player.move(Home)
>   when "a", "ahead"
>     player.move_ahead
>   when "fight", "shoot"
>     (.... check if there's a monster here, kill it with 1/2 probability,
>     otherwise make it angry ...)
>   ....
> end

Ah, ok I see.  Thx!  I like especially the "when bad". :-)

    robert