0 because inherited sets @count on subclass

Error because instance_variable_set is invalid

Solution:Step 1: Analyze inherited hook effectThe hook sets the instance variable @count to 0 on the subclass object.Step 2: Check output of instance_variable_getSince @count was set to 0, printing it returns 0.Final Answer:0 because inherited sets @count on subclass -> Option BQuick Check:Hook sets

[Solved] Consider this code:class Parent def self.inherited(subclass) subclass.... end p Child.instance_variable_get(:@count)What is the output and why? | Ruby

Ruby - Advanced Metaprogramming

Consider this code:

class Parent
  def self.inherited(subclass)
    subclass.instance_variable_set(:@count, 0)
  end
end

class Child < Parent; end

p Child.instance_variable_get(:@count)

What is the output and why?

Anil because instance variables are not set this way

B0 because <code>inherited</code> sets @count on subclass

CError because <code>instance_variable_set</code> is invalid

D1 because subclass increments @count automatically

Step-by-Step Solution

Solution:

Step 1: Analyze inherited hook effect
The hook sets the instance variable @count to 0 on the subclass object.
Step 2: Check output of instance_variable_get
Since @count was set to 0, printing it returns 0.
Final Answer:
0 because inherited sets @count on subclass -> Option B
Quick Check:
Hook sets subclass variable = output 0 [OK]

Quick Trick: Hook can set variables on subclass object [OK]

Common Mistakes:

Expecting nil because of misunderstanding variable scope
Thinking method call is invalid
Assuming automatic increment

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Consider this code:

Step 1: Analyze `inherited` hook effect

Step 2: Check output of `instance_variable_get`

Final Answer:

Quick Check:

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