[Solved] Which of the following is the correct way to define a method_added hook inside a Ruby class? — Ans: def method_added(method_name); puts "Added: #{method_name}"; end | Ruby

Ruby - Advanced Metaprogramming

Which of the following is the correct way to define a method_added hook inside a Ruby class?

Adef self.method_added(method_name); puts "Added: #{method_name}"; end

Bdef self.method_added; puts "Added method"; end

Cdef method_added(method_name); puts "Added: #{method_name}"; end

Ddef method_added; puts "Added method"; end

Step-by-Step Solution

Solution:

Step 1: Identify the correct method signature
The method_added hook is an instance method of the class's singleton class, so it should be defined as an instance method inside the class (not a class method). It receives the method name as a symbol.
Step 2: Check the options
def method_added(method_name); puts "Added: #{method_name}"; end defines def method_added(method_name) which is correct. def self.method_added(method_name); puts "Added: #{method_name}"; end defines it as a class method (self.method_added), which is incorrect. Options B and C miss the required parameter.
Final Answer:
def method_added(method_name); puts "Added: #{method_name}"; end -> Option C
Quick Check:
method_added is an instance method with one parameter [OK]

Quick Trick: Define method_added as instance method with one parameter [OK]

Common Mistakes:

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More Ruby Quizzes

Which of the following is the correct way to define a method_added hook inside a Ruby class?