You want to count how many times a class method is called across a class and all its subclasses in Ruby. Which approach is best?

hard📝 Application Q8 of 15

Ruby - Class Methods and Variables

AUse a class instance variable in the superclass and increment it in the method, ensuring subclasses call super

BUse a class variable (@@count) in the superclass and increment it in the method

CDefine an instance variable in each subclass and increment it in the method

DUse a global variable to track calls across all classes

Step-by-Step Solution

Solution:

Step 1: Understand inheritance of class variables
Class variables (@@count) are shared across a class and its subclasses in Ruby.
Step 2: Use class variable for counting
Incrementing @@count in the superclass method will track calls from all subclasses automatically.
Step 3: Evaluate other options
Class instance variables are not shared with subclasses; instance variables are per object; global variables are discouraged.
Final Answer:
Use a class variable (@@count) in the superclass and increment it in the method -> Option B
Quick Check:
Class variables are shared across subclasses [OK]

Quick Trick: Class variables are shared across subclasses [OK]

Common Mistakes:

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