gistfile1.rb

require 'benchmark'
require 'ostruct'

class LocalStruct < OpenStruct
  def run_proc(&block)
    instance_eval(&block) if block_given?
  end
end

class LocalStruct2
  def initialize(attributes={})
    if attributes.respond_to?(:each_pair)
      attributes.each_pair do |name, value|
       add_method(name){ value }
      end
    end
  end
  
  def add_method(name, &block)
    self.class.class_eval{
      define_method(name, &block)
    }
  end
  
  def run_proc(&block)
    instance_eval(&block) if block_given?
  end
end
 
 
environment = LocalStruct.new :name => 'Jordan Fowler'
environment.age = 24
environment.run_proc { puts "#{name} is #{age} years old" }
 
env2 = LocalStruct2.new :name => 'Jordan Fowler'
env2.add_method('age'){ 24 }
env2.run_proc { puts "#{name} is #{age} years old" }
 
 
n = 100_000
puts "accessing the var"
Benchmark.bm do |x|
  x.report("method_missing:") do
    n.times do
     environment.run_proc { "#{name} is #{age} years old" } # => "Jordan Fowler" 
   end
 end
  x.report("define_method:") do
    n.times do
     env2.run_proc { "#{name} is #{age} years old" }
   end
 end  
end

gistfile2.txt

Jordan Fowler is 24 years old
Jordan Fowler is 24 years old
accessing the var
      user     system      total        real
method_missing:  0.690000   0.010000   0.700000 (  0.772148)
define_method:  0.660000   0.010000   0.670000 (  0.768362)