[Solved] Which of the following when expressions correctly demonstrates Kotlin smart casting? — Ans: when (obj) { is String -> println(obj.length) else -> println("Not a string") } | Kotlin

Kotlin - Control Flow as Expressions

Which of the following when expressions correctly demonstrates Kotlin smart casting?

Awhen (obj) { is String -> println(obj.length) else -> println("Not a string") }

Bwhen (val item = obj) { is String -> println(item.length) else -> println("Not a string") }

Cwhen (obj) { obj is String -> println(obj.length) else -> println("Not a string") }

Dwhen { obj is String -> println(obj.length) else -> println("Not a string") }

Step-by-Step Solution

Solution:

Step 1: Review syntax
Kotlin smart casts work with when when using is Type directly in the branch condition.
Step 2: Analyze options
when (obj) { is String -> println(obj.length) else -> println("Not a string") } uses when (obj) { is String -> ... } which is correct syntax for smart casts.
Final Answer:
when (obj) { is String -> println(obj.length) else -> println("Not a string") } correctly uses smart casts in when.
Quick Check:
Use is Type directly in when branches [OK]

Quick Trick: Use 'is Type' directly in when branches for smart casts [OK]

Common Mistakes:

MISTAKES

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Which of the following when expressions correctly demonstrates Kotlin smart casting?