What is the output of this Kotlin code?

medium📝 Predict Output Q13 of 15

Kotlin - Null Safety

val number: Int? = 5
number?.let { println(it * 2) }

ANo output

B10

Cnull

Step-by-Step Solution

Solution:

Step 1: Check if number is null
The variable number holds 5, which is not null, so ?.let runs.
Step 2: Calculate inside let block
The lambda multiplies it (5) by 2 and prints 10.
Final Answer:
10 -> Option B
Quick Check:
Non-null value runs let, prints doubled value [OK]

Quick Trick: If variable not null, let runs and prints result [OK]

Common Mistakes:

MISTAKES

Master "Null Safety" in Kotlin

9 interactive learning modes - each teaches the same concept differently

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More Kotlin Quizzes