List creation (listOf, mutableListOf) in Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does listOf() create in Kotlin?

listOf() creates an immutable list, which means you cannot change its elements after creation.

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What is the difference between listOf() and mutableListOf()?

listOf() creates an immutable list, while mutableListOf() creates a mutable list that allows adding, removing, or changing elements.

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How do you add an element to a list created with mutableListOf()?

Use the add() function. For example: val list = mutableListOf(1, 2); list.add(3) adds 3 to the list.

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Can you change elements in a list created with listOf()?

No, lists created with listOf() are immutable. You cannot add, remove, or change elements.

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Write Kotlin code to create a mutable list of strings with elements "apple" and "banana".

val fruits = mutableListOf("apple", "banana")

Which Kotlin function creates an immutable list?

A setOf()

B listOf()

C arrayListOf()

D mutableListOf()

listOf() creates an immutable list that cannot be changed after creation.

How do you add an element to a mutable list in Kotlin?

A Using add() function

B Using set() function

C Using push() function

D Using insert() function

The add() function adds an element to a mutable list.

What happens if you try to add an element to a list created with listOf()?

A Runtime exception

B Element is added successfully

C Compilation error

D Element replaces the last item

Lists created with listOf() are immutable, so adding elements causes a runtime exception.

Which of these is a mutable list in Kotlin?

A val list = listOf(1, 2, 3)

B val list = arrayOf(1, 2, 3)

C val list = setOf(1, 2, 3)

D val list = mutableListOf(1, 2, 3)

mutableListOf() creates a mutable list that can be changed.

Which method would you use to remove an element from a mutable list?

A pop()

B delete()

C remove()

D discard()

The remove() method removes an element from a mutable list.

Explain the difference between listOf() and mutableListOf() in Kotlin.

Think about whether you can change the list after making it.

How would you create a list of numbers that you can change later? Write the Kotlin code.

Use mutableListOf and add some numbers inside parentheses.