Identifiable Items

Real lists hold structs, and two items can share a name. Give each item its own identity by making the struct Identifiable: it needs an id property that is different for every item.

struct Book: Identifiable {
    let id = UUID()
    let title: String
    let author: String
}

UUID() makes a new random, unique value each time a Book is created. With Identifiable items, ForEach needs no id: argument:

ForEach(books) { book in
    VStack(alignment: .leading) {
        Text(book.title)
            .font(.headline)
        Text(book.author)
    }
}