ruby - Ruby 中的方法和属性有什么区别？

Question

你能举个例子吗？

Answer 1

属性只是一个快捷方式。如果您使用 attr_accessor 创建属性，Ruby 只需声明一个实例变量并为您创建 getter 和 setter 方法。

既然你问了一个例子:

class Thing
    attr_accessor :my_property

    attr_reader :my_readable_property

    attr_writer :my_writable_property

    def do_stuff
        # does stuff
    end
end 

下面是您将如何使用该类:

# Instantiate
thing = Thing.new

# Call the method do_stuff
thing.do_stuff

# You can read or write my_property
thing.my_property = "Whatever"
puts thing.my_property

# We only have a readable accessor for my_readable_property
puts thing.my_readable_property 

# And my_writable_propety has only the writable accessor
thing.my_writable_property = "Whatever"