[Solved] What is the output of the following Kotlin code?val a: String? = null val b: String? = "Hello" val c: String? = null val result = a ?: b ?: c ?: "Default" println(result) | Kotlin

Kotlin - Operators and Expressions

What is the output of the following Kotlin code?

val a: String? = null
val b: String? = "Hello"
val c: String? = null

val result = a ?: b ?: c ?: "Default"
println(result)

AHello

Bnull

CDefault

DCompilation error

Step-by-Step Solution

Solution:

Step 1: Evaluate the chained Elvis operators
Variable a is null, so Elvis operator moves to b. b is "Hello", which is not null.
Step 2: Determine the final value
Since b is not null, result is assigned "Hello" and the rest is ignored.
Final Answer:
Hello -> Option A
Quick Check:
Chained Elvis picks first non-null: Hello [OK]

Quick Trick: Chained Elvis returns first non-null value [OK]

Common Mistakes:

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