Add solution without recursion

data_structures/arrays/add_digits.rb

@@ -33,6 +33,27 @@ def add_digits(num)
   add_digits(sum)
 end
 
+# puts(add_digits(38))
+# # => 2
+
+# puts(add_digits(284))
+# # => 5
+
+#
+# Approach 2: Without recursion
+#
+def add_digits(num)
+  until num.to_s.length < 2
+    digits_to_sum = num.to_s.split('')
+    num = 0
+
+    digits_to_sum.each do |number|
+      num += number.to_i
+    end
+  end
+  num
+end
+
 puts(add_digits(38))
 # => 2