Swift interview and certification questions with answers

1.What Does Swift Mean?

The Swift programming language is a language that Apple developed for various operating systems, including some of its smartphone operating systems, as well as desktop platforms.

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2.What is Swift used for programming?

Swift is a robust and intuitive programming language created by Apple for building apps for iOS, Mac, Apple TV, and Apple Watch.

It's designed to give developers more freedom than ever.

Swift is easy to use and open source, so anyone with an idea can create something incredible.

3.What language is Swift written?

The Swift compiler is written mostly in C++, and this won't change in the near future.

You can extend the standard library using Swift, but if you want to contribute a new language feature or some optimization, you'll need to write C++.

4.What is Swift and its advantages?

Swift is fast, safe, modern, and enables a level of interactivity in development.

It contains a number of features such as closures, generics, and type inference that make it much easier to use, simplifying common patterns used in Objective-C.

5.What are the main features of Swift?

Swift has many other features to make your code more expressive:

6.Is Swift frontend or backend?

Swift can be used to build software that runs on the client (frontend) and the server (backend).

7.Why Swift is faster?

Swift is faster than Objective-C, because it removed the limitations of C language and has been improved with the help of advanced software development technologies that were unavailable when C was developed.

As mentioned by Apple, Swift was originally designed to operate faster.

8.Is Swift an OOP?

OOP(Object Oriented Programming), is the three-lettered magical concept on which almost all modern programming language stands.

SWIFT, APPLE's trending language is no different from this.

OOP concepts are the backbone of SWIFT.

9. How many digits is a SWIFT code?

A SWIFT code is used to identify worldwide banks. It is made up of 8-11 characters and is commonly known as a Bank Identifier Code or BIC.

10.Who invented SWIFT code?

History. Development of Swift started in July 2010 by Chris Lattner, with the eventual collaboration of many other programmers at Apple.

11.Does Facebook use Swift?

Today, Facebook uses Swift to make it easier for developers to build their iOS-based apps and to improve user experience.

12.Is Swift hard to learn?

Swift uses a simple and expressive syntax that is easy to understand, even if you do not have any prior experience with coding.

In fact, Swift was designed to be the first programming language for anyone to learn, according to Apple .

13.Is Swift a framework?

Swift is a multipurpose, multi-paradigm compiled language created by Apple Inc.

It is used for macOS, iPadOS, iOS, watchOS, Linux, and tvOS.

The team that developed it makes use of an open-source LLVM compiler framework.

14.Is Swift the future?

Swift is a future of iOS development that assures secured and safe coding.

It easily terminates all risky code classes and thus assures to development of a secure and protected environment to create a stable solution.

Here are the reasons why developers are choosing this language.

15.How is Swift different from C++?

Swift treats double-quoted literals as the String type.

C++ treats double-quoted literals as a zero-terminated const char[] but does have a standard string type that can be used.

Both Swift and C++ support unicode. Swift provides the String type and C++ std::u16string.

16.What are the disadvantages of Swift?

The Good and the Bad of Swift Programming Language

17.Is Swift easier than Python?

Not only does its simple syntax and hand-holding help you develop faster, but it also lives up to its name: As stated on apple.com, Swift is up to 2.6x faster than Objective-C and 8.4x faster than Python.

18.Is Swift used outside of Apple?

Apple provided Swift with the capability, but the implementation will have to come from outside Apple.

That being said, the foundation for Swift expansion beyond Apple has been laid.

The Cross-Platform solutions are immature and its' server-side usage is relatively new with limited frameworks and solutions.

19.Which is best Java or Swift?

Swift vs java is both different programing languages.

They both have different methods, different code, usability, and different functionality.

Swift is more useful than Java in the future.

20.Is Swift similar to Python?

Swift is more similar to languages such as Ruby and Python than is Objective-C.

For example, it's not necessary to end statements with a semicolon in Swift, just like in Python.

21.Is Swift similar to C#?

Swift, like C#, is a type safe language. It also supports type inference so you don't have to specify the type when declaring the variables as the compiler can infer (or detect) the type by evaluating the assignment of the variable.

22.Why Swift is faster than Java?

Most of the time, Swift offers better performance as compared with Java.

Because it is a modern-day programming language and has the full support of Apple, on the other hand, Java sometimes outperforms Swift when performing actions.

23.Can I make games with Swift?

Swift is the perfect choice for game development. Developers are intrigued by Swift and want to make use of new features to develop their best games yet.

Packed with best practices and easy-to-use examples, this book leads you step by step through the development of your first Swift game.

24.What kind of apps can you make with Swift?

Here Are The Top Organizations/Applications Using Swift:

25.What is the syntax in Swift?

Programs are made up of statements, executed sequentially.

More than one statement is allowed per editor line when separated by a semicolon ( ; ).

Units of work in Swift are modularized using functions and organized into types. Functions accept one or more parameters, and return values.

26.Can I use Swift for Android?

The Swift standard library (stdlib) can be compiled for Android armv7, x86_64, and aarch64 targets, which makes it possible to execute Swift code on a mobile device running Android or an emulator.

This guide explains: How to run a simple "Hello, world" program on your Android device.

27.Is Swift used outside of Apple?

Apple provided Swift with the capability, but the implementation will have to come from outside Apple.

That being said, the foundation for Swift expansion beyond Apple has been laid.

The Cross-Platform solutions are immature and its' server-side usage is relatively new with limited frameworks and solutions.

28.Is Swift difficult to learn?

Swift uses a simple and expressive syntax that is easy to understand, even if you do not have any prior experience with coding.

In fact, Swift was designed to be the first programming language for anyone to learn, according to Apple .

29.Is Swift open source?

The Swift.org site has long served as the hub where developers come together to work on the open source Swift compiler, libraries, and tools.

Today, we are happy to announce that the Swift.org website itself is also an open source project, ready for community contributions.

30.What are libraries in Swift?

A library is simply a collection of files, for use as a dependency by other Swift code. An executable is a package that can be run, such a web server.

Dependencies are other Swift Packages you want to use code from, within your package.

31.How SWIFT code is formed?

The first four characters identify the particular institution or bank to which the transfer will be made. The next two characters specify the country.

The following two identify the location - usually the city. The final three characters are usually numerical and indicate a particular branch or office.

32.What are objects in Swift?

An object is called an instance of a class.

For example, suppose Bike is a class then we can create objects like bike1 , bike2 , etc from the class. Here's the syntax to create an object. var objectName = ClassName()

33.What is polymorphism in Swift?

polymorphism is about provisioning a single interface to entities of different types.

Although it is usually underestimated, it is one of the most powerful concepts in software engineering that lets you define different behaviors for different objects while you are still using a shared interface among them.

34.What is class type in Swift?

In Swift, there are two kinds of types:

named types and compound types.

A named type is a type that can be given a particular name when it's defined.

Named types include classes, structures, enumerations, and protocols.

For example, instances of a user-defined class named MyClass have the type MyClass .

35.Does Google use Swift?

Every workload you run on Google Cloud has zero net carbon emissions.

As you can see, Google Cloud's collaboration with SWIFT enables our customers to deploy SWIFT components on Google Cloud and supports customers' security goals.

36.Is Swift compile time or runtime language?

Swift is a strongly typed compiled programming language. This makes it a very safe programming language.

37.What language is Swift closest to?

Swift is more similar to languages such as Ruby and Python than is Objective-C.

For example, it's not necessary to end statements with a semicolon in Swift, just like in Python.

In Objective-C, on the other hand, it's necessary to do so; forgetting a semicolon at the end of just a single statement can cause errors.

38.Why is Swift a safe language?

Swift is a type-safe language, which means the language helps you to be clear about the types of values your code can work with.

If part of your code requires a String , type safety prevents you from passing it an Int by mistake.

39.How is Swift different from C++?

Swift treats double-quoted literals as the String type. C++ treats double-quoted literals as a zero-terminated const char[] but does have a standard string type that can be used.

Both Swift and C++ support unicode. Swift provides the String type and C++ std::u16string .

40.What is the best editor for Swift?

Best & Most Popular 5 Code Editor for Swift programming Language:

41.What is Swift and Kotlin?

In terms of development, Kotlin is used as a programming language for Android whereas Swift is used as a programming language for iOS app development.

Both of these languages are insanely popular due to their ease of use, overall user experience, and efficiency in coding.

42.Is Swift a compiled language?

Swift is a general-purpose, multi-paradigm, compiled programming language developed by Apple Inc. and the open-source community.

43.Can I use Swift on Windows?

Possibly to the surprise of some, it is also possible to write and run Swift code on Windows 10 systems.

Swift can be described in much the same way as many of today's newer programming languages.

Terms such as modern, clean, fast, and safe are all used to describe Swift.

44.Is Kotlin and Swift similar?

Kotlin shares several attributes with Java and was designed to streamline Android app development.

Apple's Swift, on the other hand, was designed to interface with C-based code and libraries, providing an open source approach for iOS and OS X app development.

45.What is Swift algorithm?

Swift Algorithms is an open-source package of sequence and collection algorithms, along with their related types.

Read more about the package, and the intent behind it, in the announcement on swift.org.

46.Is Swift a framework?

Swift is a multipurpose, multi-paradigm compiled language created by Apple Inc.

It is used for macOS, iPadOS, iOS, watchOS, Linux, and tvOS. The team that developed it makes use of an open-source LLVM compiler framework.

47.Can a SWIFT code be all letters?

SWIFT codes may be constituted of only a few letters and numbers, but they tell banks within the SWIFT network everything they need to know to execute international payments correctly.

48.What is structure in Swift?

In Swift, a struct is used to store variables of different data types.

For example, Suppose we want to store the name and age of a person. We can create two variables: name and age and store value. However, suppose we want to store the same information of multiple people.

49.What is extension in Swift?

Extensions add new functionality to an existing class, structure, enumeration, or protocol type.

This includes the ability to extend types for which you don't have access to the original source code (known as retroactive modeling). Extensions are similar to categories in Objective-C.

50.What is inheritance in Swift?

Inheritance allows us to create a new class from an existing class.

The new class that is created is known as subclass (child or derived class) and the existing class from which the child class is derived is known as superclass (parent or base class). Swift Inheritance Syntax.

51.What is abstraction in Swift?

Abstraction is useful when you want to define method for common classes.

For example if multiple classes is there, and they are using similar method.

In this case you can use the abstract method. In Swift Interface can achieve by Protocol. In Swift Abstraction can achieve by Protocol-Extension class ParentClass{

52.What is constructor in Swift?

In Swift, an initializer is a special function that we use to create objects of a particular class, struct, or other type.

Initializers are sometimes called constructors, because they “construct” objects.

53.Is keyword in Swift?

As far as I can look, it seems that the consensus is that the is in Swift keyword is synonymous to isKindOfClass method.

When this block of code was called, I made sure I was in my ActivityViewController tab. isKindOfClass was correct, selectedViewController is ActivityViewController was not.

54.Why Swift is called Pop?

Protocol-Oriented Programming is a new programming paradigm ushered in by Swift 2.0.

In the Protocol-Oriented approach, we start designing our system by defining protocols. We rely on new concepts: protocol extensions, protocol inheritance, and protocol compositions.

55.Is Swift good for data science?

It's actually a friendly programming language for freshers because of its concise yet expressive syntax and lightning speed to run the apps.

Swift has recently started gaining traction among the data science community. It is highly endorsed by Jeremy Howard (fast. ai's co-founder).

56.Is SWIFT code 8 or 11 digits?

A swift or BIC Code is an 8 to 11 digit code that helps identify the country, city, bank, and branch.

The format of Swift Code: Bank Code – It is the four letters that represent the bank.

57.What is closure Swift?

In Swift, a closure is a special type of function without the function name. For example, { print("Hello World") } Here, we have created a closure that prints Hello World.