[Solved] What will be the output of this Ruby code?class Demo def self.create_method(name) define_method(name) { "Hello, #{name}!" } end create_method(:greet) end d = Demo.new puts d.greet | Ruby

Ruby - Metaprogramming Fundamentals

What will be the output of this Ruby code?

class Demo
  def self.create_method(name)
    define_method(name) { "Hello, #{name}!" }
  end

  create_method(:greet)
end

d = Demo.new
puts d.greet

ANoMethodError

BHello, name!

CHello, Demo!

DHello, greet!

Step-by-Step Solution

Solution:

Step 1: Understand method creation
The class method create_method tries to define an instance method using define_method, but define_method is a private instance method of Module, so calling it directly inside a class method without receiver causes an error.
Step 2: Reason about output
Since define_method is called without receiver inside a class method, it raises NoMethodError.
Final Answer:
NoMethodError -> Option A
Quick Check:
define_method called incorrectly in class method = NoMethodError [OK]

Quick Trick: define_method must be called in instance context or with proper receiver [OK]

Common Mistakes:

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