module PerformanceCheck
  class << self
    ITERATIONS = 2
 
    def time_it
      start_time = Time.now
      yield
      Time.now - start_time
    end
 
    def without_optimization
      (1...1_000_000).select do |n|
        n.to_s == n.to_s.reverse && n.to_s(2) == n.to_s(2).reverse
      end.reduce(0, :+)
    end
 
    def with_optimization
      (1...1_000_000).select do |n|
        (base10 = n.to_s) == base10.reverse && (base2 = n.to_s(2)) == base2.reverse
      end.reduce(0, :+)
    end
 
    def profile_optimization
      result = without_optimization
      duration = time_it do
        ITERATIONS.times { without_optimization }
      end
      puts "Without optimization took #{duration/ITERATIONS}s per iteration to return #{result}"
 
      result = with_optimization
      duration = time_it do
        ITERATIONS.times { with_optimization }
      end
      puts "With optimization took #{duration/ITERATIONS}s per iteration to return #{result}"
 
    end
  end
end
 
PerformanceCheck.profile_optimization

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