What are some tips for metaprogramming in Ruby?

What are some tips for metaprogramming in Ruby?

Metaprogramming in Ruby allows you to write code that writes code. Here are some tips: 1. Use define_method to create methods dynamically. 2. Leverage method_missing to handle undefined methods gracefully. 3. Explore class_eval and instance_eval for modifying classes and instances at runtime.

Can you give an example of using define_method?

Sure! Here's a simple example:

class DynamicMethods
  def self.create_method(name)
    define_method(name) do
      "Method #{name} called"
    end
  end
end

DynamicMethods.create_method(:hello)
puts DynamicMethods.new.hello  # Output: Method hello called

What about method_missing? How does it work?

method_missing is a powerful feature that allows you to intercept calls to methods that don't exist. Here's an example:

class DynamicResponder
  def method_missing(name, *args)
    "You called #{name} with arguments: #{args.join(', ')}"
  end
end

responder = DynamicResponder.new
puts responder.any_method(1, 2, 3)  # Output: You called any_method with arguments: 1, 2, 3