Kotlin - Null Safety
Which of the following is the correct syntax to safely call the
length property of a nullable String name?Which of the following is the correct syntax to safely call the length property of a nullable String name?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the safe call syntax
The safe call operator is?., used asobject?.propertyorobject?.function().Step 2: Check each option
val len = name.length uses.without safety, which can cause a crash ifnameis null. val len = name?.length correctly uses?.. val len = name!!length uses!!incorrectly with property access. val len = name?length uses invalid syntax?length.Final Answer:
val len = name?.length -> Option BQuick Check:
Safe call syntax = ?. [OK]
Quick Trick: Safe call uses ?. between object and property [OK]
Common Mistakes:
MISTAKES- Using . without safe call on nullable
- Confusing !! with ?.
- Writing invalid syntax like ?property
Master "Null Safety" in Kotlin
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