dictionary_accessing.swift

var users: [String: User] = [:]
users["admin"] = user
users["guest"] = User(name: "Antonio Guest")

if users.isEmpty {
    print("User dictionary is empty")
} else {
    let user = users["admin"]
    print("Admin user is: \(String(describing: user))")
    // "Admin user is: Optional(__lldb_expr_59.User(name: "Medium Guest"))\n"
}