[Solved] Given the following Kotlin code, what will be the output?fun getName(user: Map): String { return user["firstName"] ?: user["nickname"] ?: user["lastName"] ?:... | Kotlin

Kotlin - Operators and Expressions

Given the following Kotlin code, what will be the output?

fun getName(user: Map): String {
    return user["firstName"] ?: user["nickname"] ?: user["lastName"] ?: "Anonymous"
}

val user1 = mapOf("firstName" to null, "nickname" to null, "lastName" to "Smith")
println(getName(user1))

AAnonymous

BCompilation error

CSmith

Dnull

Step-by-Step Solution

Solution:

Step 1: Evaluate the map values in order
firstName and nickname are null, so Elvis operator moves to lastName, which is "Smith".
Step 2: Determine the returned value
Since lastName is not null, the function returns "Smith".
Final Answer:
Smith -> Option C
Quick Check:
Elvis chain returns first non-null: Smith [OK]

Quick Trick: Elvis chains pick first non-null map value [OK]

Common Mistakes:

MISTAKES

Assuming it returns Anonymous despite lastName present
Confusing null with string "null"
Thinking map access causes error

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More Kotlin Quizzes

Given the following Kotlin code, what will be the output?

Step 1: Evaluate the map values in order

Step 2: Determine the returned value

Final Answer:

Quick Check:

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