From: Peter Ertl <pertl@...>
Date: 2006-06-08T00:58:30+09:00
Subject: Re: Getting rid of a while loop

this is _really_ strange!


d:\workspace>ruby -v
ruby 1.8.4 (2005-12-24) [i386-mswin32]

irb(main):009:0> [1,2,3].methods.grep(/slice/)
=> ["slice", "slice!"]

the methods 'each_slice' and 'enum_slice' do not exist...

is this a bug of the windows build?



> -------- Original-Nachricht --------
> Datum: Wed, 7 Jun 2006 23:57:11 +0900
> Von: "Kroeger, Simon (ext)" <simon.kroeger.ext@siemens.com>
> An: ruby-talk@ruby-lang.org
> Betreff: Re: Getting rid of a while loop
> 
> >-----Original Message-----
> > From: Robert Klemme [mailto:shortcutter@googlemail.com] 
> > Sent: Wednesday, June 07, 2006 3:47 PM
> > To: ruby-talk ML
> > Subject: Re: Getting rid of a while loop
> > 
> > 2006/6/7, James Edward Gray II <james@grayproductions.net>:
> > > On Jun 7, 2006, at 7:53 AM, Tait Pollard wrote:
> > >
> > > > I get a feeling there should be another way to make this happen
> > > > without
> > > > using a while loop, if anyone has any ideas that'd be great.
> > > >
> > > >     while question=file.gets
> > > >       answer=file.gets
> > > >       
> > @question_array[counter]=Questions.new(question,answer, false)
> > > >       counter+=1
> > > >     end
> > >
> > > One way would be:
> > >
> > > require "enumerator"
> > >
> > > # ...
> > >
> > > file.each_slice(2) do |question, answer|
> > >    @question_array << Questions.new(question, answer, false)
> > > end
> > 
> > Thanks for leaving the inject version for me. :-)
> > 
> > @question_array = file.to_enum(:each_slice, 2).inject([]) do 
> > |qa,(quest, answ)|
> >   qa << Questions.new(quest, answ, false)
> > end
> > 
> > :-))
> > 
> > robert
> 
> hehe, nice, with 1.8.4
> 
> @question_array = file.enum_slice(2).map{|q, a| Questions.new(q, a,
> false)}
> 
> should be possible, isn't it?
> 
> cheers
> 
> Simon
>