ruby - 如何使用 define_method 创建类方法？

Question

如果您尝试以元编程方式创建类方法，这将很有用:

def self.create_methods(method_name)
    # To create instance methods:
    define_method method_name do
      ...
    end

    # To create class methods that refer to the args on create_methods:
    ???
end

我要遵循的答案...

Answer 1

我认为在 Ruby 1.9 中你可以这样做:

class A
  define_singleton_method :loudly do |message|
    puts message.upcase
  end
end

A.loudly "my message"

# >> MY MESSAGE