The idea of this class is I would be able to limit the use of an api/method by sending it a key which would be an ip address or username and it would tell me if they are under the rate limit.

Here is the code:

require 'time'  class RateLimit     def initialize(time, limit)         @reset_on = Time.now + time         @limit = limit         @keys = {}     end      def increment(key)         reset if Time.now >= @reset_on          if @keys[key] == nil             @keys[key] = 1         else             @keys[key] += 1         end         return @keys[key] >= @limit     end      def current_level(key)         reset if Time.now >= @reset_on         return @keys[key]     end      def is_limited?(key)         reset if Time.now >= @reset_on         return @keys[key] != nil && @keys[key] >= @limit     end      def reset         @reset_on = Time.now + @limit         @keys = {}     end end 

To me this seems like some pretty clean code but are there any issues I have missed or things that could be done better?