[Solved] What does the method_added hook do in Ruby? — Ans: It runs automatically whenever a new instance method is defined in a class. | Ruby

Ruby - Advanced Metaprogramming

What does the method_added hook do in Ruby?

AIt runs when a class is inherited by another class.

BIt runs automatically whenever a new instance method is defined in a class.

CIt runs when a method is called on an object.

DIt runs when a module is included in a class.

Step-by-Step Solution

Solution:

Step 1: Understand the purpose of method_added
The method_added hook is a special method in Ruby that triggers automatically when a new instance method is defined inside a class.
Step 2: Compare with other hooks
Other hooks like inherited or included run on inheritance or module inclusion, not on method definition.
Final Answer:
It runs automatically whenever a new instance method is defined in a class. -> Option B
Quick Check:
method_added triggers on method definition [OK]

Quick Trick: Remember: method_added triggers on new instance methods [OK]

Common Mistakes:

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What does the method_added hook do in Ruby?