PhillyDev Slack #Daily_Programmer for March 7, 2016

hamming.rb

class HammingDistance
  def self.hammit(left, right)
    fail 'lengths don\'t match' if different_lengths?(left, right)

    (0..compare_length(left, right)).map { |index|
      left[index] == right[index]
    }.select { |result|
      result == false
    }.count
  end

  def self.compare_length(left, _)
    left.size
  end

  def self.different_lengths?(left, right)
    left.size != right.size
  end
end

left = 'GAGCCTACTAACGGGAT'
right = 'CATCGTAATGACGGCCT'
HammingDistance.hammit(left, right) == 7