ruby - Ruby 中的 `super` 是什么？

Question

这个问题在这里已经有了答案:





Super keyword in Ruby

(6 个回答)


6年前关闭。




在网上浏览关于 ruby​​ on rails 的内容时，我看到了 super 这个词。 .有人能说出它是什么以及它能做什么吗？

Answer 1

super方法调用父类方法。

例如:

class A
  def a
    # do stuff for A
  end
end

class B < A
  def a
    # do some stuff specific to B
    super
    # or use super() if you don't want super to pass on any args that method a might have had
    # super/super() can also be called first
    # it should be noted that some design patterns call for avoiding this construct
    # as it creates a tight coupling between the classes.  If you control both
    # classes, it's not as big a deal, but if the superclass is outside your control
    # it could change, w/o you knowing.  This is pretty much composition vs inheritance
  end
end

如果还不够，可以从 here进一步学习。