What will be the output of this Ruby code?

medium📝 Predict Output Q4 of 15

Ruby - Modules and Mixins

module M
  def greet
    "Hi"
  end
end

class C
  extend M
end

puts C.greet

Anil

BNoMethodError

CHi

DError: undefined method greet

Step-by-Step Solution

Solution:

Step 1: Understand extend effect
Extending module M adds its methods as class methods to class C.
Step 2: Call class method greet
Calling C.greet invokes M#greet, returning "Hi".
Final Answer:
Hi -> Option C
Quick Check:
extend adds class method = "Hi" [OK]

Quick Trick: extend adds module methods as class methods callable on class [OK]

Common Mistakes:

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