2 ways define method

metaprogrammin.rb

class Module
  def access(*args)
    args.each do |arg|
      instance_var = ("@" + arg.to_s)
      define_method(arg.to_s + '=') {|val| instance_variable_set(instance_var, val)}
      define_method(arg) { instance_variable_get(instance_var)}
    end
  end

  def attr_access(*args)
    args.each do |arg|
      module_eval "def #{arg}; @#{arg}; end;"
      module_eval "def #{arg}=(val); @#{arg} = val; end;"
    end

  end
end

class Person
  attr_access :name, :age, :long
end