[Solved] What will be the output of this Ruby code?module M def self.included(base) base.extend(ClassMethods) end module ClassMethods def greet "Hello!" end end end class C include M end puts C.greet | Ruby

Ruby - Advanced Metaprogramming

What will be the output of this Ruby code?

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

  module ClassMethods
    def greet
      "Hello!"
    end
  end
end

class C
  include M
end

puts C.greet

Anil

BNoMethodError

CSyntaxError

DHello!

Step-by-Step Solution

Solution:

Step 1: Understand the included hook behavior
The included hook extends the including class C with the ClassMethods module, adding its methods as class methods.
Step 2: Identify the method call
Calling C.greet works because greet is added as a class method by the extension.
Final Answer:
Hello! -> Option D
Quick Check:
Included hook extends class with methods = Hello! [OK]

Quick Trick: included hook can add class methods via extend [OK]

Common Mistakes:

Expecting greet as instance method
Not realizing extend adds class methods
Confusing included with prepend

Master "Advanced Metaprogramming" in Ruby

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

More Ruby Quizzes

What will be the output of this Ruby code?

Step 1: Understand the included hook behavior

Step 2: Identify the method call

Final Answer:

Quick Check:

Want More Practice?