method_missing_basics

🔍 Intercept Calls with method_missing

The method_missing hook is called when an undefined method is invoked. You can use it to catch and handle dynamic methods, such as delegating or generating behavior on the fly. Always pair it with respond_to_missing? to keep introspection working.

class DynamicHash
  def initialize
    @data = {}
  end

  def method_missing(name, *args)
    key = name.to_s.chomp("=")
    if name.to_s.end_with?("=")
      @data[key] = args.first
    else
      @data[key]
    end
  end

  def respond_to_missing?(name, _)
    true
  end
end

h = DynamicHash.new
h.color = "blue"
puts h.color           # => "blue"