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finished #20

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a9acfc1
created hamming rb file
pottery123 May 9, 2016
b50fce4
finished
pottery123 May 10, 2016
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44 changes: 44 additions & 0 deletions hamming.rb
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Original file line number Diff line number Diff line change
@@ -0,0 +1,44 @@
#class Hamming
# def self.compute(dna,sdna)
# c = []
# d = dna.split('')
# s = sdna.split('')
# if s.length != d.length
# raise ArgumentError.new("First or second strand to long") #could have used unless
# end
# not_matching_element = d.dup
# f = 0
# until f == s.length
# s.each_index do |i|
# if not_matching_element[i] != s[i]
# c << s[i]
#
# end
# f += 1
# end
# end
# return c.length
# end
# end
#
#
#


class Hamming
def self.compute(dna,sdna, counter = 0)
if dna.length != sdna.length
raise ArgumentError
end

if dna.length == 0 && sdna.length == 0
return counter

elsif
dna[0] != sdna[0]
counter += 1
end
return self.compute(dna[1..-1], sdna[1..-1], counter)

end
end
26 changes: 12 additions & 14 deletions hamming_test.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -4,72 +4,70 @@

class HammingTest < Minitest::Test
def test_identical_strands
skip

assert_equal 0, Hamming.compute('A', 'A')
end

def test_long_identical_strands
skip
assert_equal 0, Hamming.compute('GGACTGA', 'GGACTGA')
end

def test_complete_distance_in_single_nucleotide_strands
skip
assert_equal 1, Hamming.compute('A', 'G')
end

def test_complete_distance_in_small_strands
skip

assert_equal 2, Hamming.compute('AG', 'CT')
end

def test_small_distance_in_small_strands
skip

assert_equal 1, Hamming.compute('AT', 'CT')
end

def test_small_distance
skip

assert_equal 1, Hamming.compute('GGACG', 'GGTCG')
end

def test_small_distance_in_long_strands
skip

assert_equal 2, Hamming.compute('ACCAGGG', 'ACTATGG')
end

def test_non_unique_character_in_first_strand
skip

assert_equal 1, Hamming.compute('AGA', 'AGG')
end

def test_non_unique_character_in_second_strand
skip

assert_equal 1, Hamming.compute('AGG', 'AGA')
end

def test_large_distance
skip

assert_equal 4, Hamming.compute('GATACA', 'GCATAA')
end

def test_large_distance_in_off_by_one_strand
skip

assert_equal 9, Hamming.compute('GGACGGATTCTG', 'AGGACGGATTCT')
end

def test_empty_strands
skip

assert_equal 0, Hamming.compute('', '')
end

def test_disallow_first_strand_longer
skip

assert_raises(ArgumentError) { Hamming.compute('AATG', 'AAA') }
end

def test_disallow_second_strand_longer
skip

assert_raises(ArgumentError) { Hamming.compute('ATA', 'AGTG') }
end
end