From 942ff3bfd74671bbe7d73a78e473fb5168ea22b4 Mon Sep 17 00:00:00 2001
From: Jessica <jessica.weeber@gmail.com>
Date: Sat, 7 May 2016 09:51:01 -0700
Subject: [PATCH] completed hamming recursive

---
 hamming.rb      | 13 +++++++++++++
 hamming_test.rb | 14 --------------
 2 files changed, 13 insertions(+), 14 deletions(-)
 create mode 100644 hamming.rb

diff --git a/hamming.rb b/hamming.rb
new file mode 100644
index 0000000..67eceba
--- /dev/null
+++ b/hamming.rb
@@ -0,0 +1,13 @@
+class Hamming
+
+  def self.compute(distance = 0, strand1, strand2)
+    raise ArgumentError if strand1.length != strand2.length
+
+    return distance if strand1.empty? && strand2.empty?
+
+    distance += 1 if strand1[0] != strand2[0]
+
+    return self.compute(distance, strand1[1..-1], strand2[1..-1])
+  end
+
+end
\ No newline at end of file
diff --git a/hamming_test.rb b/hamming_test.rb
index 2d1f9d7..0ddf0a1 100644
--- a/hamming_test.rb
+++ b/hamming_test.rb
@@ -4,72 +4,58 @@
 
 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