2021-ruby-3-arguments-change.rb

def positional_arguments(arg1, arg2, arg3)
  puts [arg1, arg2, arg3].join(' ')
end

positional_arguments('Hello', 'Jean Luc', 'Picard')

def positional_with_hash(arg, opts = {})
  puts [arg, opts[:firstname], opts[:lastname]].join(' ')
end

positional_with_hash('hello', { firstname: 'Jean Luc', lastname: 'Picard'})
positional_with_hash('hello', firstname: 'Jean Luc', lastname: 'Picard')

hash = { firstname: 'Giordi', lastname: 'La Forge' }
positional_with_hash('Hello!', hash)

def keyword_arguments(arg: 'Welcome aboard', firstname:, lastname: )
  puts [arg, firstname, lastname].join(' ')
end

# keyword_arguments({ firstname: 'Deanna', lastname: 'Troi' }) # won't work
# keyword_arguments('Greetings', { firstname: 'Deanna', lastname: 'Troi' }) # won't work
keyword_arguments(firstname: 'Deanna', lastname: 'Troi') # will work 👍🏽

class ServiceBase
  def self.call(...)
    new.call(...)
  end
end

class ServiceObject < ::ServiceBase
  def call(id: , name: )
    [id, name].join(' ')
  end
end

ServiceObject.call(id: 'NCC-71807', name: 'Yamato')