RUBY

ruby new struct

Customer = Struct.new(:name, :email, keyword_init: true)
Customer.new(name: "John", email: "john@example.com")

ruby struct

Customer = Struct.new(:name, :address) do
  def greeting
    "Hello #{name}!"
  end
end

dave = Customer.new("Dave", "123 Main")
dave.name     #=> "Dave"
dave.greeting #=> "Hello Dave!"