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Task/Nth/Ruby/nth.rb

@@ -0,0 +1,18 @@
+class Integer
+  def ordinalize
+    num = self.abs
+    ordinal = if (11..13).include?(num % 100)
+      "th"
+    else
+      case num % 10
+        when 1; "st"
+        when 2; "nd"
+        when 3; "rd"
+        else    "th"
+      end
+    end
+    "#{self}#{ordinal}"
+  end
+end
+
+[(0..25),(250..265),(1000..1025)].each{|r| puts r.map(&:ordinalize).join(", "); puts}