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Which of the following switch cases correctly uses a where clause?

easy📝 Conceptual Q2 of 15
Swift - Control Flow

Which of the following switch cases correctly uses a where clause?

Acase x where x > 10:
Bcase let x where x > 10:
Ccase let x if x > 10:
Dcase x > 10:
Step-by-Step Solution
Solution:

  1. Step 1: Recall correct syntax for where clause in switch

    The correct syntax requires pattern matching with let or var followed by where and a condition, e.g., case let x where x > 10:.

  2. Step 2: Analyze each option

    case let x where x > 10: matches the correct syntax. case x where x > 10: misses let. case let x if x > 10: uses if instead of where. case x > 10: is invalid syntax.

  3. Final Answer:

    case let x where x > 10: -> Option B

  4. Quick Check:

    Correct where syntax = case let x where condition [OK]
Quick Trick: Use 'let' before variable in where clause [OK]
Common Mistakes:
  • Omitting 'let' or 'var' before variable
  • Using 'if' instead of 'where'
  • Writing invalid case syntax

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