[Solved] Given this Kotlin code, what will be the output? fun modifyList(list: MutableList) { list.add(5) } val numbers: List = listOf(1, 2, 3) // modifyList(numbers) // Uncommenting this line println(numbers) | Kotlin

Kotlin - Collections Fundamentals

Given this Kotlin code, what will be the output?

fun modifyList(list: MutableList) {
    list.add(5)
}

val numbers: List = listOf(1, 2, 3)
// modifyList(numbers) // Uncommenting this line
println(numbers)

A[1, 2, 3, 5]

BCompilation error due to type mismatch

C[1, 2, 3]

DRuntime exception

Step-by-Step Solution

Solution:

Step 1: Check parameter type of modifyList
Function expects MutableList, but numbers is List (immutable).
Step 2: Analyze call to modifyList
Passing immutable List to MutableList parameter causes compile-time type mismatch error.
Final Answer:
Compilation error due to type mismatch -> Option B
Quick Check:
Immutable List cannot be passed where MutableList expected [OK]

Quick Trick: MutableList parameter requires mutable argument [OK]

Common Mistakes:

MISTAKES

Expecting runtime error
Assuming implicit conversion
Thinking List can be passed to MutableList

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More Kotlin Quizzes

Given this Kotlin code, what will be the output?

Step 1: Check parameter type of modifyList

Step 2: Analyze call to modifyList

Final Answer:

Quick Check:

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