hamming/hamming.rb at master · Lindsay-R/hamming · GitHub

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require_relative "testing_library"

def hamming(strand_1, strand_2)
    index = 0
    ham = 0
    while index < [(strand_1.length),(strand_2.length)].min
        if strand_1[index] != strand_2[index] then ham += 1
        end
        index +=1
    end
    return ham
end


check("Hamming distance between identical strands",
      hamming("A", "A") == 0)

check("Hamming distance for single nucleotide strand",
      hamming("A", "G") == 1)

check("Hamming distance between small strands",
      hamming("AG", "CT") == 2)

check("Hamming distance between two other small strands",
      hamming("AT", "CT") == 1)

check("Hamming distance in longer strands",
      hamming("GGACG", "GGTCG") == 1)

check("Ignoring extra length in the first strand when it's longer",
      hamming("AAAG", "AAA") == 0)

check("Ignoring extra length in the second strand when it's longer",
      hamming("AAA", "AAAG") == 0)