Which of the following is the correct syntax for a when expression checking if x is an Int type in Kotlin?

easy📝 Syntax Q3 of 15

Kotlin - Control Flow as Expressions

Which of the following is the correct syntax for a when expression checking if x is an Int type in Kotlin?

Awhen (x) { type Int -> "Integer" }

Bwhen (x) { is Int -> "Integer" }

Cwhen (x) { instanceof Int -> "Integer" }

Dwhen (x) { Int -> "Integer" }

Step-by-Step Solution

Solution:

Step 1: Recall Kotlin type checking syntax
Kotlin uses is Type inside when to check types.
Step 2: Identify correct syntax
when (x) { is Int -> "Integer" } uses is Int correctly. Other options use invalid or Java-like syntax.
Final Answer:
when (x) { is Int -> "Integer" } -> Option B
Quick Check:
Use 'is Type' to check type in when = A [OK]

Quick Trick: Use 'is' keyword to check type in when expression [OK]

Common Mistakes:

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