From: Shannon Fang <xrfang@...>
Date: 2002-12-03T23:11:31+09:00
Subject: Re: Conditional block operations

Hi,

>From: "Roman Rytov" <rrytov@entopia.com>
>Reply-To: ruby-talk@ruby-lang.org
>To: ruby-talk@ruby-lang.org (ruby-talk ML)
>Subject: Conditional block operations
>Date: Tue, 3 Dec 2002 22:58:15 +0900
>
>Is there a way to filter results of EACH or COLLECT functions? Let's say
>in
>
>file.each do |line|
>   a, b = line.split(pattern)
>End

I think for this case, the easist way might be

file.each do |line|
   a, b = line.split(pattern) if line !~ /^\s*$/
end

But for the next one, I have no idea. I think it has something related to 
array.each and array.each_index, because in collect, the |x| seems is the 
element itself, not the index. For example.

>
>myarray.collect {|x| x + ", "}
>

myarray.each_index do |i|
  myarray[i]+=", " if i%2
end

Shannon





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