[Solved] What will be the output of the following Ruby code?class Parent @@value = 1 def self.value @@value end def self.value=(v) @@value = v end end class Child < Parent end Parent.value = 5 puts Child.value | Ruby

Ruby - Class Methods and Variables

What will be the output of the following Ruby code?

class Parent
  @@value = 1
  def self.value
    @@value
  end
  def self.value=(v)
    @@value = v
  end
end

class Child < Parent
end

Parent.value = 5
puts Child.value

A5

BError

Cnil

D1

Step-by-Step Solution

Solution:

Step 1: Understand class variable sharing
The class variable @@value is shared between Parent and Child classes.
Step 2: Trace the assignment and output
Setting Parent.value = 5 changes @@value to 5 for both classes. So, Child.value returns 5.
Final Answer:
5 -> Option A
Quick Check:
Class variables shared, so Child.value = 5 [OK]

Quick Trick: Class variables share values across subclasses [OK]

Common Mistakes:

Assuming Child has its own separate @@value
Expecting default value 1 after change
Confusing class variables with instance variables

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More Ruby Quizzes

What will be the output of the following Ruby code?

Step 1: Understand class variable sharing

Step 2: Trace the assignment and output

Final Answer:

Quick Check:

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