Which of the following Swift switch statements is syntactically correct and exhaustive for an enum Direction with cases north, south, east, and west?
easy📝 Syntax Q12 of 15
Swift - Control Flow
Which of the following Swift switch statements is syntactically correct and exhaustive for an enum Direction with cases north, south, east, and west?
Aswitch dir { case .north: print("North") case .south: print("South") }
Bswitch dir { case .north: print("North") case .south: print("South") case .east: print("East") case .west: print("West") }
Cswitch dir { case .north: print("North") case .south: print("South") case .east: print("East") }
Dswitch (dir) { case .north: print("North") case .south: print("South") default: print("Other") }
Step-by-Step Solution
Solution:
Step 1: Check all enum cases covered
The enum has four cases: north, south, east, west. The switch must cover all or use default.
Step 2: Analyze each option
switch dir { case .north: print("North") case .south: print("South") case .east: print("East") case .west: print("West") } covers all four cases explicitly, making it exhaustive and syntactically correct.
Final Answer:
switch with all four cases covered explicitly -> Option B
Quick Check:
All enum cases covered = D [OK]
Quick Trick:Cover all enum cases or use default to be exhaustive [OK]
Common Mistakes:
Missing some enum cases
Not using default when cases are incomplete
Assuming partial cases are enough
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