From: botp <botpena@...>
Date: 2007-08-13T02:24:15+09:00
Subject: Re: Split a string based on change of character

On 8/12/07, dblack@rubypal.com <dblack@rubypal.com> wrote:
> Hi --
>
> On Sun, 12 Aug 2007, botp wrote:
>
> > On 8/11/07, dblack@rubypal.com <dblack@rubypal.com> wrote:
> >>> s = "ZBBBCZZ"
> >>> x = s.split('').group_by{|x| x}.entries
> >>>
> >>> or possibly to
> >>>
> >>> x = s.split('').group_by.entries
> >>
> >> I'm going to have to get special glasses that can read invisible
> >> ink.... :-)
> >
> > whoops, sorry =)
> > that should be
> >
> > fr
> >   x = s.split('').group_by{|x| x}.entries.map{|x| x.join}
> >
> > to
> >   x = s.split('').group_by.entries.map{|x| x.join}
> >
> > i assume that group_by without a block would group the elements by
> > themselves. maybe i should name it group not group_by   :)
>
> Actually I think group_by with nothing specified just returns an
> enumerator over the array itself, so it probably will never be used (I
> hope :-)
>
> I don't think group_by will work for this problem, though, because it
> groups everything together:
>
> irb(main):014:0> s
> => "AABCDAAE"
> irb(main):015:0> s.split(//).group_by {|x| x }.map {|e| e.join }
> => ["AAAAA", "CC", "EE", "DD", "BB"]
>
> Notice how all the A's got put in one result.
>
>
> David
>
> --
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>
>