Why Method_added hook in Ruby? - Purpose & Use Cases

The Big Idea

What if your code could notice every new method all by itself?

The Scenario

Imagine you are writing a Ruby class and want to track every time a new method is added. Without any special tool, you have to manually add logging or tracking code inside each method you write.

The Problem

This manual way is slow and error-prone because you might forget to add the tracking code in some methods. It also clutters your code and makes it harder to read and maintain.

The Solution

The method_added hook automatically runs a piece of code every time a new method is defined in a class. This means you can track or modify methods without touching each one manually.

Before vs After

✗ Before

def greet
  puts 'Hello'
  puts 'Method added!'
end

✓ After

def self.method_added(name)
  puts "New method added: #{name}"
end

What It Enables

This lets you automatically respond to method creation, making your code cleaner and more powerful.

Real Life Example

For example, you can use method_added to log every new method in a class for debugging or to enforce coding rules automatically.

Key Takeaways

Manually tracking methods is tedious and error-prone.

method_added hook runs code automatically when methods are defined.

This makes your code cleaner and easier to maintain.