[Solved] You want to safely unwrap two optionals and... Which is the best way to use guard for this?func combine(_ a: String?, _ b: String?) { // Fill in guard statement print("Combined: \(aVal) & \(bVal)") } | Swift

Swift - Control Flow

You want to safely unwrap two optionals and exit early if either is nil. Which is the best way to use guard for this?

func combine(_ a: String?, _ b: String?) {
    // Fill in guard statement
    print("Combined: \(aVal) & \(bVal)")
}

Aif let aVal = a, let bVal = b { } else { return }

Bguard let aVal = a else { return } guard let bVal = b else { return }

Cguard a != nil && b != nil else { return }

Dguard let aVal = a, let bVal = b else { return }

Step-by-Step Solution

Solution:

Step 1: Understand multiple optional unwrapping with guard
Guard allows multiple bindings separated by commas to unwrap multiple optionals safely.
Step 2: Choose the best concise syntax
guard let aVal = a, let bVal = b else { return } unwraps both optionals in one guard statement and exits early if either is nil.
Final Answer:
guard let aVal = a, let bVal = b else { return } -> Option D
Quick Check:
Use commas to unwrap multiple optionals in one guard [OK]

Quick Trick: Use commas in guard to unwrap multiple optionals at once [OK]

Common Mistakes:

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You want to safely unwrap two optionals and exit early if either is nil. Which is the best way to use guard for this?