iOS Development For Beginners 3

Question 1

In Swift, which keyword declares a constant whose value cannot change?

Accepted Answer

let

Answer

var

Answer

const

Answer

final

Question 2

Which keyword declares a variable that can be changed later in Swift?

Accepted Answer

var

Answer

let

Answer

mutable

Answer

dynamic

Question 3

What is an Optional in Swift?

Accepted Answer

A type that can hold either a value or nil

Answer

A required parameter

Answer

A type of loop

Answer

A UI component

Question 4

Which symbol is used to mark a type as Optional in Swift?

Accepted Answer

?

Answer

!

Answer

*

Answer

&

Question 5

What does the 'func' keyword do in Swift?

Accepted Answer

Declares a function

Answer

Declares a class

Answer

Imports a framework

Answer

Creates a loop

Question 6

In Swift, which collection type stores ordered values accessed by index?

Accepted Answer

Array

Answer

Dictionary

Answer

Set

Answer

Tuple

Question 7

Which Swift collection stores key-value pairs?

Accepted Answer

Dictionary

Answer

Array

Answer

Set

Answer

Stack