[Solved] Find the problem in this code snippet:module M module_eval do def greet 'Hello' end end end M.greet — Ans: NoMethodError because greet is an instance method, not module method | Ruby

Ruby - Advanced Metaprogramming

Find the problem in this code snippet:

module M
  module_eval do
    def greet
      'Hello'
    end
  end
end

M.greet

ARuntimeError due to missing class context

BSyntaxError due to wrong module_eval usage

CReturns 'Hello' correctly

DNoMethodError because greet is an instance method, not module method

Step-by-Step Solution

Solution:

Step 1: Identify method type defined by module_eval
The method greet is defined as an instance method inside the module.
Step 2: Check method call on module
Calling M.greet tries to call a module method, but greet is not a module method, causing NoMethodError.
Final Answer:
NoMethodError because greet is an instance method, not module method -> Option D
Quick Check:
Instance method called on module = NoMethodError [OK]

Quick Trick: Instance methods need an instance, module methods called on module [OK]

Common Mistakes:

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