iOS Development Swift Programming Language

Question 1

What keyword is used in Swift to declare a constant?

Accepted Answer

let

Answer

var

Answer

const

Answer

final

Question 2

Which Swift feature allows a variable to hold either a value or nil?

Accepted Answer

Optional

Answer

Enum

Answer

Tuple

Answer

Closure

Question 3

What does the `guard` statement do in Swift?

Accepted Answer

Exits the current scope if a condition is false

Answer

Handles errors thrown by a function

Answer

Iterates over a sequence

Answer

Declares a deferred action

Question 4

Which Swift collection type stores key-value pairs?

Accepted Answer

Dictionary

Answer

Array

Answer

Set

Answer

Tuple

Question 5

What is a Swift closure?

Accepted Answer

A self-contained block of functionality that can be passed around

Answer

A method that initializes a class

Answer

A type alias for a protocol

Answer

A property observer

Question 6

Which Swift keyword is used to handle thrown errors?

Accepted Answer

do-catch

Answer

try-except

Answer

guard-else

Answer

if-let