New method implementation with instance_eval

gistfile1.rb

#
# Some class for example
#
class SomeClass
  def a_method
    puts '>> a defined method: a_method'
  end
end

#
# new method implementation with instance_eval
#
puts 'new method implementation with instance_eval...'

obj = SomeClass.new

new_method_name = 'a_new_method'

obj.instance_eval %Q{
  def #{new_method_name}
    a_method
    puts ">> a new added method: #{new_method_name}"
  end
}

obj.send(new_method_name)