[Solved] Find the error in this Ruby code using the included hook:module Logger def included(base) base.extend(ClassMethods) end module ClassMethods def log(msg) puts "Log:... | Ruby

Ruby - Advanced Metaprogramming

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

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

  module ClassMethods
    def log(msg)
      puts "Log: #{msg}"
    end
  end
end

class App
  include Logger
end

App.log("Start")

AThe include statement should be extend.

BThe ClassMethods module should be included, not extended.

CThe log method should be an instance method, not class method.

DThe included method should be defined as self.included, not instance method.

Step-by-Step Solution

Solution:

Step 1: Check how included hook is defined
The included hook must be a module method, defined as self.included, not an instance method.
Step 2: Understand the effect of incorrect definition
Defining included without self means it won't run automatically on include, so base.extend won't happen.
Final Answer:
The included method should be defined as self.included, not instance method. -> Option D
Quick Check:
included hook must be self.included [OK]

Quick Trick: Define included as self.included to run on module include [OK]

Common Mistakes:

Defining included without self
Confusing extend and include in hook
Trying to call class method on instance

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More Ruby Quizzes

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

Step 1: Check how included hook is defined

Step 2: Understand the effect of incorrect definition

Final Answer:

Quick Check:

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