Kotlin - Null Safety
What will be the output of the following Kotlin code?
val list: List = listOf("apple", null, "banana")
println(list.size)
println(list[1] == null)
What will be the output of the following Kotlin code? val list: List = listOf("apple", null, "banana") println(list.size) println(list[1] == null)
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze the list declaration
The list is of type ListStep 2: Evaluate the print statements
list.size returns 3 because there are three elements. list[1] is null, so list[1] == null evaluates to true.Final Answer:
3 true -> Option CQuick Check:
Nullable list size and null check = 3 and true [OK]
Quick Trick: Nullable list can hold nulls; size counts all elements [OK]
Common Mistakes:
MISTAKES- Assuming null elements are excluded from size
- Expecting false for null equality check
- Thinking code causes compilation error
Master "Null Safety" in Kotlin
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