ruby 我应该使用 self.或者 @ [英] ruby should I use self. or @

问题描述

这是我的红宝石代码

class Demo
  attr_accessor :lines

  def initialize(lines)
    self.lines = lines
  end
end

在上面的代码中我可以使用

In the above code I could have used

    @lines = lines

我经常看到人们在 initialize 方法中使用 @.在这两者中是否有首选的方法?为什么?

Mostly I see people using @ in initialize method. Is there a preferred way of doing among these two and why?

推荐答案

当您使用 @lines 时，您正在访问实例变量本身.self.lines 实际上是通过了类的lines 方法；同样，self.lines = x 通过 lines= 方法.所以当你想直接访问变量时使用@，当你想通过方法访问时使用self..

When you use @lines, you are accessing the instance variable itself. self.lines actually goes through the lines method of the class; likewise, self.lines = x goes through the lines= method. So use @ when you want to access the variable directly, and self. when you want to access via the method.

要直接回答您的问题，通常您想直接在 initialize 方法中设置实例变量，但这取决于您的用例.

To directly answer your question, normally you want to set the instance variables directly in your initialize method, but it depends on your use-case.

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