From: Sander Land <sander.land@...>
Date: 2006-07-18T03:03:34+09:00
Subject: Re: First ruby code, need hint on iterator

On 7/17/06, Gerr <gerald@frobble.com> wrote:
> Hello,
>
> Consider the following code which generates a hexdump of a string:
> ...
> What would be the idiomatic solution for this in Ruby ? Any other comments on
> the code are welcome as well, ofcourse

If you want to do things with 16 bytes at a time, you might as well
process them in groups of 16:

require 'enumerator'
module Dump
  def hexdump
    offset = 0
    out = ''
    split('').each_slice(16) {|chars|
	  hc = chars.map{|c| "%02x " % c[0] }
	  hex = hc[0..7] << '- ' << hc[8..15]
	  str = chars.map{|c| (c[0] >= 32 && c[0] <= 127) ? c : "." }
	  out << sprintf("%08x: %-50s %s\n", offset, hex, str)
	  offset += 16
	}
	return out;
  end
end

or even:

module Dump
  def hexdump
    offset = -16
    split('').enum_slice(16).map {|chars|
  	  hc = chars.map{|c| "%02x " % c[0] }
	  hex = hc[0..7] << '- ' << hc[8..15]
	  str = chars.map{|c| (c[0] >= 32 && c[0] <= 127) ? c : "." }
	  sprintf("%08x: %-50s %s\n", offset += 16, hex, str)
	}.join
  end
end