Could Use Self
Warns if a method is sent to the superclass explicitly but the method is not implemented in any of the superclasses.
Do not use the superclass if the subclass does not implement the method being called. In this situation, use self. For example, the subclass calls super xxxx, where xxxx is not implemented in the subclass.
Instead, write it as self xxxx.
Last modified date: 05/19/2020