Kotlin - Null Safety
How can you safely call a method
process() on an object obj that might be null, and if null, call defaultProcess() instead?How can you safely call a method process() on an object obj that might be null, and if null, call defaultProcess() instead?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Use safe call to call process() if obj not null
The safe callobj?.process()callsprocess()only ifobjis not null.Step 2: Use Elvis operator to call defaultProcess() if obj is null
The Elvis operator?:callsdefaultProcess()if the safe call returns null.Final Answer:
obj?.process() ?: defaultProcess() -> Option DQuick Check:
Safe call + Elvis operator for fallback method call [OK]
Quick Trick: Use ?. with ?: to provide fallback method call [OK]
Common Mistakes:
MISTAKES- Calling method without safe call on nullable
- Using logical operators instead of Elvis
- Calling methods on null without checks
Master "Null Safety" in Kotlin
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