From: Brian Candler <b.candler@...>
Date: 2009-01-13T18:20:48+09:00
Subject: Re: XOR two binary strings

I'm not sure if "binary string" meant a string of the form "000101...", 
or if it meant two strings treated as arrays of bytes.

If the latter, then

irb(main):001:0> require 'enumerator'
=> true
irb(main):002:0> s1 = "abc".to_enum(:each_byte)
=> #<Enumerable::Enumerator:0xb7cc85dc>
irb(main):003:0> s2 = "\x02\x04\x06".to_enum(:each_byte)
=> #<Enumerable::Enumerator:0xb7cc02c4>
irb(main):004:0> s1.zip(s2).map{ |x,y| (x^y).chr }.join
=> "cfe"

ruby 1.9 lets you shorten this to

irb(main):001:0> "abc".bytes.zip("\x02\x04\x06".bytes).map { |x,y| 
(x^y).chr }.join
=> "cfe"
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