[Solved] What will be the output of the following Ruby code? module Greetings def hello "Hello from module" end end class Person extend Greetings end puts Person.hello | Ruby

Ruby - Modules and Mixins

What will be the output of the following Ruby code?

module Greetings
  def hello
    "Hello from module"
  end
end

class Person
  extend Greetings
end

puts Person.hello

ANoMethodError: undefined method 'hello' for Person

BHello from module

CHello from module called on instance

DSyntaxError

Step-by-Step Solution

Solution:

Step 1: Understand extend Greetings effect
The module's method hello becomes a class method of Person.
Step 2: Check method call
Person.hello calls the class method, which exists and returns "Hello from module".
Final Answer:
Hello from module -> Option B
Quick Check:
Class method from extend = "Hello from module" [OK]

Quick Trick: extend adds module methods as class methods, so Person.hello works [OK]

Common Mistakes:

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