You have a list of nullable strings: val names: List = listOf("Anna", null, "Bob"). How do you safely print the length of the third element or print 0 if it is null?

hard📝 Application Q8 of 15

Kotlin - Collections Fundamentals

You have a list of nullable strings: val names: List = listOf("Anna", null, "Bob"). How do you safely print the length of the third element or print 0 if it is null?

Aprintln(names[2]!!.length)

Bprintln(names[2].length ?: 0)

Cprintln(names.getOrNull(2)?.length ?: 0)

Dprintln(names.get(2).length)

Step-by-Step Solution

Solution:

Step 1: Access third element safely
Use getOrNull(2) to safely get the third element or null if out of bounds.
Step 2: Use safe call and default
Use safe call ?.length to get length if not null, else null. Then use Elvis operator ?: 0 to default to 0.
Final Answer:
println(names.getOrNull(2)?.length ?: 0) -> Option C
Quick Check:
Safe access with getOrNull and ?.length with default [OK]

Quick Trick: Combine getOrNull and ?. to safely access nullable list elements [OK]

Common Mistakes:

MISTAKES

Using !! which throws if null
Not using getOrNull causing exceptions
Using ?: on non-nullable types incorrectly

Master "Collections Fundamentals" in Kotlin

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

More Kotlin Quizzes

You have a list of nullable strings: val names: List = listOf("Anna", null, "Bob"). How do you safely print the length of the third element or print 0 if it is null?

Step 1: Access third element safely

Step 2: Use safe call and default

Final Answer:

Quick Check:

Want More Practice?