 iOS Interview Prep 4- Singleton pattern

singleton.swift

class DatabaseManager {
    static let databaseObj = DatabaseManager()
    
    private init() {
    }
    
    func checkDatabaseAccess(user: String) {
        if user == ("Sung-Jie") {
            print("Access Granted!")
        } else {
            print("Access Denied!")
        }
    }
}

let userName = "Sung-Jie"
let database = DatabaseManager.databaseObj
database.checkDatabaseAccess(user: userName)

// Console output:
// Access Granted!