[Solved] Identify the mistake in this Kotlin code:val text: String? = null val length = text ?: 0.length — Ans: Using 0.length is invalid because Int has no length property | Kotlin

Kotlin - Null Safety

Identify the mistake in this Kotlin code:

val text: String? = null
val length = text ?: 0.length

AUsing <code>0.length</code> is invalid because Int has no length property

BThe Elvis operator is used incorrectly; it should be <code>?:=</code>

CNullable variable <code>text</code> cannot be used with Elvis operator

DThe variable <code>length</code> must be declared as nullable

Step-by-Step Solution

Solution:

Step 1: Analyze right side of Elvis operator
0.length attempts to access length on an Int, which is invalid.
Step 2: Understand Elvis operator usage
The Elvis operator itself is correctly used as ?:.
Step 3: Identify error
The error is due to invalid property access on Int.
Final Answer:
Using 0.length is invalid because Int has no length property -> Option A
Quick Check:
Int type has no length property [OK]

Quick Trick: Check property access matches variable type [OK]

Common Mistakes:

MISTAKES

Master "Null Safety" in Kotlin

9 interactive learning modes - each teaches the same concept differently

More Kotlin Quizzes

Identify the mistake in this Kotlin code: