[Formatting Lists] https://www.andyibanez.com/posts/formatting-notes-and-gotchas/?utm_source=SwiftLee+-+Subscribers&utm_campaign=3c6b8fddc4-EMAIL_CAMPAIGN_2020_03_02_08_48_COPY_01&utm_medium=email&utm_term=0_e154f6bfee-3c6b8fddc4-5192977

FormattingList.swift

//We can also format lists. Suppose you want to say “Apples, eggs, and pears” when you have the following array:

let items = ["apples", "eggs", "pears"]
//You can probably think of a clever way to concatenate the first two items only with a comma and then follow the last item with the word “and”. In fact doing so may not be complicated, but we have ListFormatter which allows us to do just that in just one line of code:

let items = ["apples", "eggs", "pears"]
//ListFormatter.localizedString(byJoining: items) // apples, eggs, and pears

//If you remove one of the elements, the formatter will do the right thing:
let items = ["apples", "pears"]
ListFormatter.localizedString(byJoining: items) // apples and pears