[Solved] In Kotlin, what is the primary use of the Elvis operator ?:? — Ans: To provide a fallback value when an expression is null | Kotlin

Kotlin - Null Safety

In Kotlin, what is the primary use of the Elvis operator ?:?

ATo concatenate two strings

BTo provide a fallback value when an expression is null

CTo declare a nullable variable

DTo throw an exception explicitly

Step-by-Step Solution

Solution:

Step 1: Understand the Elvis operator
The Elvis operator ?: is used to return the left-hand side if it is not null; otherwise, it returns the right-hand side.
Step 2: Identify its purpose
Its main purpose is to provide a default or fallback value when a nullable expression evaluates to null.
Final Answer:
To provide a fallback value when an expression is null -> Option B
Quick Check:
Elvis operator returns default if null [OK]

Quick Trick: Elvis operator returns default if null [OK]

Common Mistakes:

MISTAKES

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In Kotlin, what is the primary use of the Elvis operator ?:?