Kotlin - Null Safety
Which of the following is the correct syntax to declare a nullable String variable in Kotlin?
Which of the following is the correct syntax to declare a nullable String variable in Kotlin?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Recall Kotlin nullable syntax
Kotlin uses?after the type name to mark it nullable, e.g.,String?.Step 2: Check each option
var name: String? usesString?correctly. Options A, B, and D use invalid syntax.Final Answer:
var name: String? -> Option AQuick Check:
Nullable syntax = type followed by?[OK]
Quick Trick: Put
? right after the type name for nullable [OK]Common Mistakes:
MISTAKES- Placing
?before the type - Using
!instead of? - Writing 'nullable' keyword explicitly
Master "Null Safety" in Kotlin
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