2: Kotlin basics

Question 1

Which of the following declares an unchangeable list of strings?

• val school = arrayOf("shark", "salmon", "minnow")

• var school = arrayOf("shark", "salmon", "minnow")

• val school = listOf("shark", "salmon", "minnow")

• val school = mutableListOf("shark", "salmon", "minnow")

Question 2

What will be the output of the following code? for (i in 3..8 step 2) print(i)

• 345678

• 468

• 38

• 357

Question 3

What is the purpose of the question mark in this code? var rocks: Int? = 3

• The type of the variable rocks isn't fixed.

• The variable rocks can be set to null.

• The variable rocks cannot be set to null.

• The variable rocks shouldn't be initialized right away.