How to Use guard let for Early Exit

Steps

1. Paste the code into a Swift file or playground.
2. Run it once to verify the output.
3. Adjust the inputs to match your use case.

Copy and paste

import Foundation

func greet(user: String?) {
    guard let user = user else {
        print("Missing user")
        return
    }

    print("Hello, (user)")
}

greet(user: nil)

Notes

• Keep functions small and focused for reuse.
• Prefer safe APIs like optionals and guards.