Kotlin - Null Safety
Which Kotlin code snippet safely calls
printLength() on a nullable String input and provides a default message if null?Which Kotlin code snippet safely calls printLength() on a nullable String input and provides a default message if null?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand safe call with let
input?.let { printLength(it) }callsprintLengthonly ifinputis not null.Step 2: Use Elvis operator for default
The Elvis operator provides a fallbackprintln("No input")ifinputis null.Final Answer:
input?.let { printLength(it) } ?: println("No input") -> Option AQuick Check:
Safe call with let and Elvis handles null safely [OK]
Quick Trick: Use ?.let { } ?: for safe calls with default [OK]
Common Mistakes:
MISTAKES- Calling function directly on nullable without safe call
- Using !! which can throw exceptions
- Providing empty string instead of default message
Master "Null Safety" in Kotlin
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