Cacher is the code snippet organizer for pro developers

 → ruby benchmark.rb
Rehearsal -------------------------------------------
Without   0.090000   0.000000   0.090000 (  0.080811)
With      0.080000   0.000000   0.080000 (  0.082315)
---------------------------------- total: 0.170000sec

              user     system      total        real
Without   0.080000   0.000000   0.080000 (  0.082895)
With      0.090000   0.000000   0.090000 (  0.083551)

require 'benchmark'

fibonacci = Hash.new{ |h,k| h[k] = k < 2 ? k : h[k-1] + h[k-2] }

Benchmark.bmbm do |x|

  x.report('Without') do
    1_000_000.times do
      fibonacci[10]
    end
  end

  x.report('With') do
    1_000_000.times do
      begin
        fibonacci[10]
      rescue Exception => e
      end
    end
  end

end