[Solved] What does Kotlin's null safety feature ensure when working with collections like List or Set? — Ans: It prevents storing null values in collections declared without nullable types. | Kotlin

Kotlin - Null Safety

What does Kotlin's null safety feature ensure when working with collections like List or Set?

AIt prevents storing <code>null</code> values in collections declared without nullable types.

BIt automatically converts all <code>null</code> values to empty strings in collections.

CIt allows <code>null</code> values in any collection without restrictions.

DIt disables the use of collections if they contain <code>null</code> values.

Step-by-Step Solution

Solution:

Step 1: Understand Kotlin's null safety in collections
Kotlin distinguishes between nullable and non-nullable types. Collections declared with non-nullable types cannot hold null values.
Step 2: Apply this to collection elements
If a collection is declared as List<String>, it cannot contain null. To allow null, it must be declared as List<String?>.
Final Answer:
It prevents storing null values in collections declared without nullable types. -> Option A
Quick Check:
Null safety = no null in non-nullable collections [OK]

Quick Trick: Non-nullable collections disallow null elements [OK]

Common Mistakes:

MISTAKES

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What does Kotlin's null safety feature ensure when working with collections like List or Set?