Job offersCompaniesTestsBlogI'm an employerSign upLog in
fr
fr
Home>IT Tests>Questions>Swift

41 interview questions on Swiftfor developers (2025)

Test your technical skills before an interview of Swift with 41 corrected questions. Beginner, Intermediate or Expert level.

or
Technology
Profession
Test
Sort by
Newest
Most popular
Last review
Filter by
Published
3812
To review
26
41 questions
Hard
2 votes427 runs
2 comments

How to check if a variable is defined in Swift

Mobile developer
swift
optionals
Jorge Gomesat Nov 27, 2021
Hard
1 vote433 runs0 comment

What is the purpose of the required keyword in Swift?

Mobile developer
swift
constructor
Smart&Softat Nov 5, 2021
Hard
1 vote421 runs0 comment

Use dispatch_once from Grand Central Dispatch,Declare the portion of code whose result is stored in a static let in Swift.

Mobile developer
dispatch_once
static let
Smart&Softat Nov 16, 2021
Hard
1 vote419 runs0 comment

What are the 3 reasons to use weak var monProtocol: PokemonDelegate?

Mobile developer
protocol
struct
class
Smart&Softat Nov 27, 2021
Easy
1 vote413 runs0 comment

Swift: What is the output of the following code? `var x = 10; x = x + undefined; print(x)`

Mobile developer
optional
Smart&Softat Nov 27, 2021
Easy
1 vote405 runs0 comment

Is the following code valid? ``` var x = 10 var y = x ```

Mobile developer
swift
Smart&Softat Nov 27, 2021
Easy
0 vote471 runs0 comment

Is the following a valid Swift variable name? 'undefined'

Mobile developer
swift
Smart&Softat Apr 12, 2023
Medium
0 vote441 runs0 comment

How to use the `switch` statement in Swift

Mobile developer
swift
optionals
Smart&Softat Nov 27, 2021
Medium
0 vote440 runs0 comment

Automatic retain and release markers during compilation, freeing manual memory management

Mobile developer
memory management
swift
Smart&Softat Nov 27, 2021
Medium
0 vote434 runs0 comment

How to use the `switch` statement in Swift

Mobile developer
swift
optionals
Smart&Softat Nov 27, 2021
Easy
0 vote426 runs0 comment

How to make a property editable in InterfaceBuilder

Mobile developer
swift
interface builder
Smart&Softat Nov 27, 2021
Expert
0 vote425 runs
1 comment

What is the type of an undefined variable in Swift?

Mobile developer
types
Smart&Softat Nov 3, 2021
Medium
0 vote422 runs0 comment

How to use the internal notification center in Swift

Mobile developer
swift
error
Smart&Softat Nov 16, 2021
Medium
0 vote415 runs0 comment

Swift: What is the difference between unowned and weak?

Mobile developer
swift
unowned
Smart&Softat Nov 27, 2021
Hard
0 vote414 runs0 comment

Write a Swift function that takes a closure as a parameter and returns the result of the closure.

Mobile developer
closures
parameters
Smart&Softat Nov 27, 2021
Easy
0 vote413 runs0 comment

Explain the difference between frame and bounds in SwiftUI.

Mobile developer
swift
frame
bounds
Smart&Softat Nov 27, 2021
Medium
0 vote413 runs0 comment

How to use the `switch` statement in Swift

Mobile developer
swift
optionals
Smart&Softat Nov 27, 2021
Medium
0 vote411 runs0 comment

A weak reference does not increase the retain count of an object

Mobile developer
swift
references
Smart&Softat Nov 27, 2021
Easy
0 vote410 runs0 comment

Swift's `guard` statement

Mobile developer
conditionals
Jorge Gomesat Nov 27, 2021
Easy
0 vote410 runs0 comment

Write a Swift function that takes an array of strings and returns a new array with the strings in reverse order.

Mobile developer
array
functions
Smart&Softat Nov 27, 2021
Swift tests