Benchmarking Memoizing of Ruby Methods

benchmark.rb

require 'benchmark'

class MyClassWithStuff
  
  DEFAULT_VALS = { one: '1' }
  
  def memoized_fetch
    @value ||= DEFAULT_VALS[:one]
  end

  def straight_fetch
    DEFAULT_VALS[:one]
  end
  
end

TIMES = 10000

CALL_TIMES = 1000

Benchmark.bmbm do |test|
  test.report("Memoized") do
    TIMES.times do
      instance = MyClassWithStuff.new
      CALL_TIMES.times { |i| instance.memoized_fetch }
    end
  end
  test.report("Lookup") do
    TIMES.times do
      instance = MyClassWithStuff.new
      CALL_TIMES.times { |i| instance.straight_fetch }      
    end
  end
end