FIT5046 - Week 2: Kotlin Basics and Jetpack Compose Flashcards

Question 1

In Kotlin, what is the keyword for declaring a mutable variable?

Accepted Answer

var

Question 2

In Kotlin, what is the keyword for declaring a read-only variable?

Accepted Answer

val

Question 3

True or False: By default, all classes in Kotlin can be subclassed.

Accepted Answer

False, Kotlin classes are final by default.

Question 4

What keyword must be added to a Kotlin class to allow other classes to inherit from it?

Accepted Answer

open

Question 5

What is the default visibility modifier for classes and members in Kotlin?

Accepted Answer

public

Question 6

What modifier is used when a non-nullable mutable property will be initialized after class creation?

Accepted Answer

lateinit

Question 7

What are three rules for using the lateinit modifier in Kotlin?

Accepted Answer

It must be non-nullable, mutable (var), and cannot be used on primitive types.

Question 8

By default, are variables in Kotlin nullable or non-nullable?

Accepted Answer

Non-nullable.

Question 9

What operator is used in Kotlin to declare a nullable type?

Accepted Answer

The safe call operator (?) after the type name (e.g., String?).

Question 10

What does the safe call operator (?.) do in Kotlin?

Accepted Answer

It executes a call on a nullable object only if the object is not null, returning null otherwise.

Question 11

What does the non-null assertion operator (!!) do in Kotlin?

Accepted Answer

It forces a nullable value to be treated as non-nullable, throwing an exception if it is null.

Question 12

What keyword is used to declare a function in Kotlin?

Accepted Answer

fun

Question 13

If a Kotlin function does not return a value, what is its default return type?

Accepted Answer

Unit

Question 14

What are named arguments in Kotlin?

Accepted Answer

Arguments passed to a function by explicitly specifying the parameter name, which allows changing their order.

Question 15

What is a lambda expression in Kotlin?

Accepted Answer

An anonymous function that can be passed directly as an argument to another function.

Question 16

What is a higher-order function in Kotlin?

Accepted Answer

A function that accepts another function as a parameter or returns a function.

Question 17

What is the trailing lambda syntax in Kotlin?

Accepted Answer

If a function's last parameter is a lambda, the lambda expression can be placed outside the parentheses.

Question 18

What does the implicit 'it' keyword represent inside a Kotlin lambda?

Accepted Answer

It replaces a single argument passed to the lambda so you do not have to name it.

Question 19

Which Kotlin function is used to declare an immutable list?

Accepted Answer

listOf()

Question 20

Which Kotlin function is used to declare a list whose contents can be modified?

Accepted Answer

mutableListOf()

Question 21

What is Jetpack Compose?

Accepted Answer

Android's recommended modern declarative toolkit for building UIs in Kotlin.

Question 22

What annotation is required to mark a function as a builder of user interface elements?

Accepted Answer

@Composable

Question 23

What does a composable function take as input and what does it emit?

Accepted Answer

It takes in data and emits UI elements.

Question 24

What annotation is used to view a composable function's UI in Android Studio without running the app?

Accepted Answer

@Preview

Question 25

What are the three most common standard layouts in Jetpack Compose?

Accepted Answer

Column, Row, and Box.

FIT5046 - Week 2: Kotlin Basics and Jetpack Compose

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