value types in swift

valueTypes.swift

struct Book {
    var title: String
    
    init(title: String) {
        self.title = title
    }
}

var bookOne = Book(title: "A Game of Thrones (1996)")
var bookTwo = bookOne // bookTwo now created a new copy from bookOne

bookTwo.title = "A Storm of Swords (2000)"
print(bookOne.title) // Output: "A Game of Thrones (1996)"
print(bookTwo.title) // Output: "A Storm of Swords (2000)"