[Solved] Identify the error in this Kotlin code snippet: val set = setOf(1, 2, 3) set.add(4) — Ans: Compile-time error: add() is not a function of Set | Kotlin

Kotlin - Collections Fundamentals

Identify the error in this Kotlin code snippet:

val set = setOf(1, 2, 3)
set.add(4)

ARuntime error: UnsupportedOperationException when calling add()

BSyntax error: setOf cannot be used without mutable keyword

CCompile-time error: add() is not a function of Set

DNo error, set will contain 4 elements

Step-by-Step Solution

Solution:

Step 1: Understand setOf creates immutable set
The setOf() function returns an immutable set that does not support modification.
Step 2: Analyze calling add() on immutable set
Calling add() on a Set<T> causes a compile-time error because Set<T> has no add() method.
Final Answer:
Compile-time error: add() is not a function of Set -> Option C
Quick Check:
Immutable set + add() = compile error [OK]

Quick Trick: Immutable sets have no add() method: compile error [OK]

Common Mistakes:

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