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I watched the talk "Formatters: Make data human-friendiy" from WWDC 2020 and want to understand/reproduce the examples, especially for "How we can make well-formated lists" Question: What do I have to change in my playground to reproduce the results of the examples. let items = [ "English", "French", "Spanish"] ListFormatter.localizedString(byJoining: items) let items1 = ["English", "Spanish"] ListFormatter.localizedString(byJoining: items1) let items2 = ["Spanish", "English"] ListFormatter.localizedString(byJoining: items2) // Spanisch Localisation let itemsInSpanish = ["Ingleés", "Espñol"] ListFormatter.localizedString(byJoining: itemsInSpanish) let itemsINSpanish2 = [ "Espanol", "Ingles" ] ListFormatter.localizedString(byJoining: itemsINSpanish2) Thank you for your time.