[Solved] What is a key difference between a class instance variable and a class variable in Ruby? — Ans: Class instance variables belong to the class object itself, not shared with... | Ruby

Ruby - Class Methods and Variables

What is a key difference between a class instance variable and a class variable in Ruby?

AClass instance variables are shared across all instances of the class.

BClass instance variables automatically inherit values from parent classes.

CClass instance variables are accessible only inside instance methods.

DClass instance variables belong to the class object itself, not shared with subclasses.

Step-by-Step Solution

Solution:

Step 1: Understand class instance variables
Class instance variables are tied to the class object itself, not shared with subclasses or instances.
Step 2: Compare with class variables
Class variables (starting with @@) are shared among the class and its subclasses, unlike class instance variables.
Final Answer:
Class instance variables belong to the class object itself, not shared with subclasses. -> Option D
Quick Check:
Class instance variable behavior = Class instance variables belong to the class object itself, not shared with subclasses. [OK]

Quick Trick: Class instance vars belong to class object, not shared with subclasses [OK]

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What is a key difference between a class instance variable and a class variable in Ruby?