From: Robert Dober <robert.dober@...>
Date: 2009-06-15T20:08:59+09:00
Subject: Re: formatting a listing

On Mon, Jun 15, 2009 at 12:46 PM, George
George<george.githinji@gmail.com> wrote:
> i have a listing which looks like this
> 1
> 2
> 3
>
> 3
> 4
> 5
>
> 20
> 3
> 5
> 5
>
> i would like a quick way to format that output such that i end up with 3
> columns like the following.
> 1,2,20
> 2,4,3
> 3,5,5
>    5
>
> any ideas?
> thanks

If this is a homework assignement I am terribly sorry, but I cannot know.

puts DATA.inject( [  [] ] ){ | ary, ele |
  ele.strip.empty? ? ary << [] : ary.last << ele.to_i # or ele.chomp
if you prefer
  ary
}
.reject( &:empty? )  # .map( &:join, ", " ) is not standard Ruby
.map{ | eles | eles.join( ", " )}

__END__
1
2

42
44
46

2000

HTH
Robert
-- 
Toutes les grandes personnes ont d’abord été des enfants, mais peu
d’entre elles s’en souviennent.

All adults have been children first, but not many remember.

[Antoine de Saint-Exupéry]