Swift - Optionals
Which of these expressions correctly uses the nil coalescing operator to provide a default value of 10 when
optionalInt is nil?Which of these expressions correctly uses the nil coalescing operator to provide a default value of 10 when optionalInt is nil?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify correct nil coalescing syntax
The operator is used asoptionalValue ?? defaultValue.Step 2: Check each option
let value = optionalInt ?? 10 matches the correct syntax; others are invalid or incorrect.Final Answer:
let value = optionalInt ?? 10 -> Option DQuick Check:
Correct nil coalescing syntax [OK]
Quick Trick: Use
optional ?? default to provide fallback [OK]Common Mistakes:
- Swapping operands
- Using ternary operator syntax
- Using ?: which is not Swift
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