Kotlin - Variables and Type System
How would you explicitly declare a nullable string variable in Kotlin and assign it a null value?
How would you explicitly declare a nullable string variable in Kotlin and assign it a null value?
hard📝 Application Q9 of 15
Step-by-Step Solution
Solution:
Step 1: Understand nullable type syntax
In Kotlin, a nullable type is declared by adding a question mark after the type, e.g.,String?.Step 2: Assign null to nullable variable
var name: String? = null correctly declares a mutable nullable string variable and assigns it null.Final Answer:
var name: String? = null -> Option BQuick Check:
Nullable type uses '?' after type [OK]
Quick Trick: Add '?' after type to allow null values [OK]
Common Mistakes:
MISTAKES- Assigning null to non-nullable type
- Using quotes around null
- Incorrect nullable syntax
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