What will this Swift function print when called with checkNumber(5)?

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Swift - Control Flow

What will this Swift function print when called with checkNumber(5)?

func checkNumber(_ number: Int?) {
    guard let num = number, num > 10 else {
        print("Number is too small or nil")
        return
    }
    print("Number is \(num)")
}

ANumber is 5

BNumber is 10

CNumber is too small or nil

DNo output

Step-by-Step Solution

Solution:

Step 1: Evaluate guard condition with input 5
Guard checks if number is non-nil and greater than 10. 5 is less than 10, so condition fails.
Step 2: Understand guard failure consequences
Since condition fails, the else block runs, printing "Number is too small or nil" and returning early.
Final Answer:
Number is too small or nil -> Option C
Quick Check:
Guard with multiple conditions exits early if any fail [OK]

Quick Trick: Guard with commas means AND conditions must all pass [OK]

Common Mistakes:

Thinking guard passes if only one condition is true
Ignoring early return on guard failure
Assuming output prints number regardless

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More Swift Quizzes

What will this Swift function print when called with checkNumber(5)?

Step 1: Evaluate guard condition with input 5

Step 2: Understand guard failure consequences

Final Answer:

Quick Check:

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