some notes to help me with define_method

define_method.rb

# here lies some notes to help me with define_method
class MetaTest
  define_method(:meta_1) do
    puts 'm.meta_1'
  end

  def initialize
    @a_var = 'iable'
  end
  
  define_method(:meta_2) do
    puts 'm.meta_2 with a_var' + @a_var
  end

  # don't do this
  class_eval %Q?
    def meta_3
      puts 'm.meta_3 with a_var' + @a_var + ' with class_eval'
    end
  ?

  # don't do this
  instance_eval %Q?
    def meta_4
      puts 'MetaTest.meta_4 with instance_eval'
    end
  ?

  class << self
    define_method(:meta_5) do
      puts 'MetaTest.meta_5 with define_method'
    end
  end
end

m = MetaTest.new
m.meta_1
m.meta_2
m.meta_3
MetaTest.meta_4
MetaTest.meta_5

# Output
# m.meta_1
# m.meta_2 with a_variable
# m.meta_3 with a_variable with class_eval
# MetaTest.meta_4 with instance_eval
# MetaTest.meta_5 with define_method