instance_variable_set/get 与 attr_writer/reader
在某些情况下，我应该在 instance_varaible_set/instance_variable_get 或 attr_writer/attr_reader 之间进行选择来访问实例变量物体是从外面来的吗？它们在速度等方面有何不同？
我的印象是，如果您想让最终用户访问实例变量是一个开放的方法，应该使用 attr_writer/attr_reader 来简化它，但是如果您如果想私下使用它，您宁愿使用 instance_varaible_set/instance_variable_get。这种理解正确吗？
Are there any situations where I should chose between instance_varaible_set/instance_variable_get or attr_writer/attr_reader to access an instance variable of the object from outside of it? How are they different in terms of speed, or etc?
I had the impression that if you want to let accessing the instance variable an opened method to the end user, attr_writer/attr_reader should be used to make it easy, but if you want to use it privately, you would rather use instance_varaible_set/instance_variable_get. Is this understanding correct?
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
这是正确的。您可以在类定义中定义
attr_accessor/attr_reader/attr_writer以使它们访问（隐式或显式创建的）实例变量。如果类不是由您编写的并且不存在此类访问器，您仍然可以使用
instance_variable_get/instance_variable_set读取/写入私有实例变量。This is correct. You define
attr_accessor/attr_reader/attr_writerinside class definition to make them access (implicitly or explicitly created) instance variable.If class wasn't written by you and no such accessors exist, you still can read/write private instance variables using
instance_variable_get/instance_variable_set.