Data commit

Task/Digital-root/Ruby/digital-root.rb

@@ -0,0 +1,24 @@
+class String
+  def digroot_persistence(base=10)
+    num = self.to_i(base)
+    persistence = 0
+    until num < base do
+      num = num.digits(base).sum
+      persistence += 1
+    end
+    [num.to_s(base), persistence]
+  end
+end
+
+puts "--- Examples in 10-Base ---"
+%w(627615 39390 588225 393900588225).each do |str|
+  puts "%12s has a digital root of %s and a persistence of %s." % [str, *str.digroot_persistence]
+end
+puts "\n--- Examples in other Base ---"
+format = "%s base %s has a digital root of %s and a persistence of %s."
+[["101101110110110010011011111110011000001", 2],
+ [ "5BB64DFCC1", 16],
+ ["5", 8],
+ ["50YE8N29", 36]].each do |(str, base)|
+   puts format % [str, base, *str.digroot_persistence(base)]
+end