Which of the following Kotlin variable declarations allows the variable to hold either a String value or null?

easy📝 Conceptual Q2 of 15

Kotlin - Null Safety

Which of the following Kotlin variable declarations allows the variable to hold either a String value or null?

Avar name: String?

Bvar name: String

Cvar name: Nullable<String>

Dvar name: String!!

Step-by-Step Solution

Solution:

Step 1: Understand Kotlin nullability
In Kotlin, appending ? to a type makes it nullable, allowing it to hold null.
Step 2: Analyze options
- var name: String? allows null.
- var name: String does not allow null.
- Nullable is not valid Kotlin syntax.
- String!! is invalid syntax.
Final Answer:
var name: String? -> Option A
Quick Check:
Nullable types use ? suffix [OK]

Quick Trick: Use ? suffix to allow null values [OK]

Common Mistakes:

MISTAKES

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