[Solved] What is a major risk when using Ruby class variables (@@) in inheritance? — Ans: They are shared across the entire inheritance chain, causing unexpected value... | Ruby

Ruby - Class Methods and Variables

What is a major risk when using Ruby class variables (@@) in inheritance?

AThey are shared across the entire inheritance chain, causing unexpected value changes.

BThey are private to each instance and cannot be accessed by subclasses.

CThey automatically reset to nil when a subclass is created.

DThey can only store integer values.

Step-by-Step Solution

Solution:

Step 1: Understand class variable scope
Class variables in Ruby are shared among a class and all its subclasses, meaning one change affects all.
Step 2: Identify the risk in inheritance
This sharing can cause unexpected behavior if subclasses modify the variable, impacting other classes.
Final Answer:
They are shared across the entire inheritance chain, causing unexpected value changes. -> Option A
Quick Check:
Class variable sharing = unexpected changes [OK]

Quick Trick: Class variables share state across subclasses, beware side effects [OK]

Common Mistakes:

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What is a major risk when using Ruby class variables (@@) in inheritance?