Which of the following is the correct syntax to use let with a nullable variable num to print its double value?

easy📝 Syntax Q3 of 15

Kotlin - Null Safety

Which of the following is the correct syntax to use let with a nullable variable num to print its double value?

Anum?.let { println(it * 2) }

Bnum.let { println(it * 2) }

Cnum?.let println(it * 2)

Dnum?.let { println(num.length) }

Step-by-Step Solution

Solution:

Step 1: Identify safe call usage
Only num?.let safely calls let if num is not null.
Step 2: Check lambda syntax
The lambda block must be inside curly braces { } and use it to refer to num.
Final Answer:
num?.let { println(it * 2) } -> Option A
Quick Check:
Correct let syntax with safe call = num?.let { println(it * 2) } [OK]

Quick Trick: Always use curly braces and it inside let lambda [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