[Solved] What will be the output of the following Ruby code?module M module_eval do def hello 'Hello from M' end end end class C include M end puts C.new.hello | Ruby

Ruby - Advanced Metaprogramming

What will be the output of the following Ruby code?

module M
  module_eval do
    def hello
      'Hello from M'
    end
  end
end

class C
  include M
end

puts C.new.hello

AHello from M

BNoMethodError

CSyntaxError

Dnil

Step-by-Step Solution

Solution:

Step 1: Understand method definition inside module_eval
The method hello is defined inside module M using module_eval, so it becomes an instance method of M.
Step 2: Check class inclusion and method call
Class C includes M, so instances of C have hello method. Calling C.new.hello returns 'Hello from M'.
Final Answer:
Hello from M -> Option A
Quick Check:
module_eval defines method, include makes it accessible = D [OK]

Quick Trick: module_eval defines methods accessible after include [OK]

Common Mistakes:

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