Exercism: "Hamming distance in Ruby"

This is my solution to the Hamming problem in Ruby:

	class Hamming
	def self.compute(strand1, strand2)
	def self.base_distance(base1, base2)
	def self.both_exists?(base1, base2)
	not [base1, base2].any? {|base| base.nil?}
	end
	(both_exists?(base1, base2) and base1 != base2) ? 1 : 0
	end
	strand1.chars.zip(strand2.chars).map do |base1, base2|
	base_distance(base1, base2)
	end.reduce(:+)
	end
	end

view raw hamming.rb hosted with ❤ by GitHub

I tried to improve readability by creating the helper class methods base_distance and both_exists?. I also wanted to play a bit with map and reduce.

You can see two other versions here. I used zip in all of them.

This exercise served me to practice a bit with some Ruby collection functions.