[Solved] Identify the error in this Ruby code using the included hook:module M def included(base) base.extend(ClassMethods) end module ClassMethods def hello "Hi" end end end class C include M end puts C.hello | Ruby

Ruby - Advanced Metaprogramming

Identify the error in this Ruby code using the included hook:

module M
  def included(base)
    base.extend(ClassMethods)
  end

  module ClassMethods
    def hello
      "Hi"
    end
  end
end

class C
  include M
end

puts C.hello

Aextend should be include

BClassMethods module is missing

Cincluded should be a class method (self.included)

DNo error, code runs fine

Step-by-Step Solution

Solution:

Step 1: Check included hook definition
The included hook must be defined as a class method with self.included, not as an instance method.
Step 2: Understand the impact
Defining it without self. means the hook never runs, so hello is not added as a class method.
Final Answer:
included should be a class method (self.included) -> Option C
Quick Check:
included hook must be self.included [OK]

Quick Trick: Define included as self.included to trigger hook [OK]

Common Mistakes:

Defining included as instance method
Forgetting self. prefix
Confusing extend with include

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Identify the error in this Ruby code using the included hook:

Step 1: Check included hook definition

Step 2: Understand the impact

Final Answer:

Quick Check:

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