Meta Programming Example

MetaProgramming.rb

class Profile
  def self.field(name, type)
    # Metaprogramming magic!
    define_method(name) do 
      @attributes ||= {} # If @attributes doesn't exist, create it as an empty hash
      @attributes[name] 
    end

    define_method("#{name}=") do |value|
      @attributes ||= {}
      @attributes[name] = value
    end
  end
end

class UserProfile < Profile
  field :name, :string
  field :age, :integer
  field :bio, :text
end

user = UserProfile.new
user.name = "Alice"
user.age = 30
user.bio = "Loves coding and cookies."

puts user.name # Output: Alice