require 'benchmark/lab'

def method_names(number)
  number.times.map do
    10.times.inject("") { |e| e << ('a'..'z').to_a.sample}
  end
end

class DefineMethod
  def self.def_methods(_methods)
    _methods.each do |method_name|
      define_method method_name do
        puts "win"
      end
    end
  end
end

class ModuleEvalWithString
  def self.def_methods(_methods)
    _methods.each do |method_name|
      module_eval %{
        def #{method_name}
          puts "win"
        end
      }
    end
  end
end

def fast(input_size)
  DefineMethod.def_methods(method_names(input_size))
end

def slow(input_size)
  ModuleEvalWithString.def_methods(method_names(input_size))
end


nbr_of_samples = 20
(1..10).each do |power|
  input_size = 10**power
  puts "Test for input size #{input_size}"
  Benchmark.experiment(nbr_of_samples) do |x|
    x.report("module_eval with string") { slow(input_size) }
    x.report("define_method")           { fast(input_size) }
  end
end