From: Jay Levitt <jay+news@...>
Date: 2007-10-01T06:40:13+09:00
Subject: Re: Detecting number ranges

On Fri, 28 Sep 2007 07:13:39 +0900, Harry Kakueki wrote:
> Here is the same code with comments I probably should have included
> the first time.

Thanks!  For my own educational purposes (and any future newbies reading
this), I renamed a bunch of variables, extracted some temp variables and
came up with the following.  It still has one bug (doesn't handle
non-contiguous ranges like [1, 2, 133]), but I think I could fix that on my
own...

db_server_pairs = []
server_dbs = {}

# .scan will return an array of matches
DATA.readlines.each do |line| 
  db_server_pairs << line.scan(/\d+/).map{|num| num.to_i}
end

servers = db_server_pairs.map{|pair| pair[1]}.uniq 
#=> [..., 7, ...]

servers.each do |server|
  my_pairs = db_server_pairs.select{|pair| pair[1] == server}
  #=> [[8, 7], [10, 7], ...]
 
  server_dbs[server] = my_pairs.sort.map {|pair| pair[0]}
  #=> [8, 9, 10]
end

server_dbs.keys.sort.each do |server|
  first = server_dbs[server][0]
  last  = server_dbs[server][-1]
  print "server #{server} handles database #{first} to #{last}\n"
end

__END__
database 8 is on server 7
database 10 is on server 7
database 9 is on server 7
database 5 is on server 9
database 1 is on server 3
database 2 is on server 3
database 133 is on server 3
database 4 is on server 144





-- 
Jay Levitt                |
Boston, MA                | My character doesn't like it when they
Faster: jay at jay dot fm | cry or shout or hit.
http://www.jay.fm         | - Kristoffer