Kotlin - Null Safety
Which of the following is the correct syntax to declare a mutable list that can hold null strings in Kotlin?
Which of the following is the correct syntax to declare a mutable list that can hold null strings in Kotlin?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Kotlin syntax for nullable types
To allow null elements, the element type must be nullable, written as String?.Step 2: Check correct mutable list declaration
mutableListOfFinal Answer:
val list = mutableListOfQuick Check:
Nullable element type inside mutableListOf = correct syntax [OK]
Quick Trick: Put ? after element type, not after mutableListOf [OK]
Common Mistakes:
MISTAKES- Placing ? after mutableListOf instead of element type
- Using invalid syntax like
- Adding ? after the whole expression incorrectly
Master "Null Safety" in Kotlin
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