Kotlin - Null Safety
You want to store a user's middle name which might be missing. How should you declare this variable in Kotlin to handle null safely?
You want to store a user's middle name which might be missing. How should you declare this variable in Kotlin to handle null safely?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand nullable type usage
Since middle name can be missing, use nullable typeString?.Step 2: Initialize nullable variable with null
AssigningnulltoString?is allowed and safe.Final Answer:
var middleName: String? = null -> Option CQuick Check:
Nullable String initialized to null = Correct [OK]
Quick Trick: Use
? for variables that can be null [OK]Common Mistakes:
MISTAKES- Assigning null to non-nullable String
- Using empty string instead of null
Master "Null Safety" in Kotlin
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