New Syntax of Optional Unwrapping in Swift 5.7 (WWDC 2022)

New Syntax of Optional Unwrapping in Swift 5.7 (WWDC 2022) — Most Popular Interview Question 😊

Apple also announced Swift 5.7 which will come along with the release of Xcode 14. Let’s check out new Swift 5.7’s new optional unwrapping syntax.

Optional Binding is a common way to find out whether a value in optional exist or not. see code snippets

Typical way of Optional Unwrapping !!!

var userName: String?
if let userName = userName {
    print("User name: \(userName)")
}

New Syntax:

Now, We can simply ignore the assignment after the if let or guard let statement, and the Swift compiler will automatically unwrap the optional for us. Under the hood compiler create a non-optional value with the exact same variable name.

struct UserModel {
    var userName: String?
    
    var getUserName: String {
        if let userName {
            return userName
        }
        return "N/A"
    }
}
var getUserName: String {
      guard let userName else {
            return "N/A"
        }
       return userName
    }

Unwrapping multiple Optionals!!!

struct UserModel {
    var userName: String?
    var userId: String?
    var loginTime: String?
    
    func printLoginDetails() {
        guard let userName, let userId, let loginTime else {
            print("Unable to find details")
        }
        print("User name with :\(userName) having user Id: \(userId) logged in at : \(loginTime)")
    }
}

Conclusion:

Optional binding extensively used in writing Swift code, this will make code more readable, removing duplicate variable. And obviously save time by reducing number of keystrokes 😊

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