Kotlin - Null Safety
Which of the following Kotlin statements correctly uses the safe cast operator as??
Which of the following Kotlin statements correctly uses the safe cast operator as??
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Review correct safe cast syntax
The safe cast operator isas?without spaces betweenasand?.Step 2: Identify correct spacing and usage
val s = obj as? String uses correct syntax with no spaces and proper nullable type.Final Answer:
val s = obj as? String -> Option BQuick Check:
Safe cast syntax isas?without spaces = D [OK]
Quick Trick: Safe cast operator is 'as?' with no spaces [OK]
Common Mistakes:
MISTAKES- Adding spaces between 'as' and '?'
- Using unsafe cast syntax with '?'
- Confusing nullable type syntax with safe cast
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