Kotlin - Null Safety
What will be the output of this Kotlin code?
val name: String? = null val displayName = name ?: "Guest" println(displayName)
What will be the output of this Kotlin code?
medium📝 Predict Output Q13 of 15
Step-by-Step Solution
Solution:
Step 1: Check the value of
The variablenamenameis explicitly set tonull.Step 2: Apply the Elvis operator
Sincenameis null,displayNamegets the default value "Guest".Final Answer:
Guest -> Option BQuick Check:
null ?: "Guest" = "Guest" [OK]
Quick Trick: If left is null, Elvis returns right side [OK]
Common Mistakes:
MISTAKES- Assuming it prints null
- Thinking it prints variable name
- Expecting a compile error
Master "Null Safety" in Kotlin
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