tcmacdonald · November 9, 2018 20:36 · Nov 9, 2018 · Nov 9, 2018
diff --git a/gistfile1.txt → question-marks.rb b/gistfile1.txt → question-marks.rb
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -0,0 +1,40 @@
+def question_marks(str)
+  # Get any number + chars + number pattern...
+  regex = /(\d)[a-zA-Z\?]*(\d)/
+
+  # Iterate over each occurrence and return the MatchData object
+  matches = str.to_enum(:scan, regex).map { Regexp.last_match }
+
+  # Iterate over each match and return a boolean meeting the following conditions...
+  bools = matches.collect do |match|
+
+    # Do the numbers at the beginning and end of the string add up to 10?
+    if match[1].to_i + match[2].to_i == 10
+      # Are there exactly 3 question marks within the string?
+      match.to_s.scan(/\?/).count == 3
+    end
+
+  end.compact # .compact removes any nil entries
+
+  # Evaluate if all items in our array are true and return the result
+  !bools.empty? && bools.all?
+end
+
+
+# ---------------------------------------- //
+
+str = "arrb6???4xxbl5???eee5"
+puts "#{str}: #{question_marks(str)}" # true
+
+str = "aa6?9"
+puts "#{str}: #{question_marks(str)}" # false
+
+str = "acc?7??sss?3rr1??????5"
+puts "#{str}: #{question_marks(str)}" # true
+
+str = "dk7???3j??hk8???2jd?k?sj?hfkj"
+puts "#{str}: #{question_marks(str)}" # true
+
+str = "dk7??3j??hk8???2jd?k?sj?hfkj"
+puts "#{str}: #{question_marks(str)}" # false
+
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