Implementation of attr_accessor

attr_accessor.rb

module Fatter
  def self.included(base)
    base.class_eval do
      def self.fattr_accessor(_symbol)
        raise "NotASymbol" unless _symbol.is_a? Symbol
        ivar_as_symbol = ("@" + _symbol.to_s).to_sym

        define_method(_symbol.to_s) do
          self.instance_variable_get(ivar_as_symbol)
        end

        define_method(_symbol.to_s + "=") do |arg|
          self.instance_variable_set(ivar_as_symbol, arg)
        end
      end
    end
  end
end

class Dawg
  include Fatter
  fattr_accessor(:name)
end

irb(main):024:0> fido = Dawg.new
=> #<Dawg:0x007f8361efff38>
irb(main):025:0> fido.name =
irb(main):026:0* end
SyntaxError: (irb):26: syntax error, unexpected keyword_end
	from /Users/mzemel/.rbenv/versions/2.1.2/bin/irb:11:in `<main>'
irb(main):027:0> fido.name = "Fido"
=> "Fido"
irb(main):028:0> fido.name
=> "Fido"