What is Swift? The complete 2026 guide
We’re only a couple of months away from the new year, which means it’s time to start looking ahead to the tech trends that will dominate the software industry in 2026. As the new year approaches, we want to help you get familiar with upcoming trends so you can be prepared and start taking your skills to the next level. Today, we’ll discuss Swift.
The Swift programming language is a general-purpose, open-source programming language designed by Apple. The language is influenced by Python, making it fast and intuitive. Swift is mainly used for native iOS and macOS development. Many popular apps including LinkedIn, Lyft, and WordPress are written in Swift. If you’re interested in iOS development, Swift is a great language to learn. Let’s learn more about this popular language!
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What is Swift?#
Swift is a multi-paradigm, general-purpose, open-source programming language for iPadOS, macOS, tvOS, watchOS, and iOS development. It was created by Apple in 2014 to give developers a powerful language to develop iOS apps. According to swift.org, the language was designed to be safe, fast, and expressive. It’s intended to be a replacement for C-based languages. The Swift language is constantly evolving, and the community continues to grow. Swift source code can be found on GitHub, making it easy for anyone to access the code.
Swift features#
- Powerful generics: Generics allow you to write flexible, reusable functions and types that can work with any type.
- Native error handling: Swift provides support for throwing, catching, propagating, and manipulating errors at runtime.
- Structs and classes: Swift allows you to define a structure or class in a single file, and the external interface is made available for other code to use.
- Protocol extensions: Swift allows you to define behavior on protocols themselves, rather than in global functions or individual conformances.
- Memory safety: Swift automatically manages memory and prevents unsafe behavior from happening in your code.
- Memory management: With Automatic Reference Counting (ARC), Swift tracks and manages our app’s memory usage. This means we don’t need to worry about memory management ourselves.
- Flexible enumerations: Swift enums support pattern matching and can have payloads.
- Package manager: The Swift package manager is a cross-platform tool we can use to build, run, test, and package Swift libraries and executables.
- Debugging: Swift uses the LLDB debugger, which provides you with a REPL and debugger to enable integrated debugging, consistent formatting, failure recovery, and expression evaluation.
- Source and binary compatibility: The latest version of Swift has binary compatibility for apps. Swift libraries are included in every operating system release, so your apps will use the latest version of the library in the OS, and your code can run without recompiling.
- Tuples: Tuples allow us to create and share value groupings. We can use tuples to return multiple values as a single value.
- Closure syntax: Swift has a lightweight closure syntax, which has optimizations to enable a clutter-free syntax and clear style.
Why should I learn Swift?#
Swift was designed to be easy to learn and easy to use. Apple created the language with beginner coders in mind. Whether you’re still in school, exploring a new career path, or wanting to learn how to code, Swift was created to be a simple and intuitive first language to learn. If you’re new to coding, Swift Playgrounds is an iPad app that makes it easy to get started with Swift coding.
Once you learn Swift, you’ll be an appealing candidate for potential employers. Swift developers are in high demand. According to Apple, the company has created around two million jobs in the United States. According to Indeed, the average salary for an iOS developer in the U.S. is $116,804. If you want to get into app development, Swift is a smart language to learn.
Let’s take a look at some of the pros and cons of the Swift programming language.
Swift pros#
- Fast and powerful: Swift uses LLVM compiler technology and its standard library makes writing code intuitive and efficient.
- Modern: Swift APIs are easy to read and maintain. Inferred types make your code cleaner and less error-prone. Modules eliminate headers and provide namespaces.
- Easy to learn: Swift was designed with beginner programmers in mind. You can use Swift Playgrounds for iPad to get started with Swift code, and you can access courses to learn how to build Xcode apps.
- Safe: Swift has a variety of safety features, such as automatic memory management, value types, and variable initialization. In Swift, objects can never be
nil, and the Swift compiler will stop you if you try to use anilobject. These features help prevent runtime crashes. - Cross-platform: Swift supports all Apple platforms, Linux, Windows, and Ubuntu.
- Dynamic libraries: Dynamic libraries exist outside of your code and are uploaded when needed. Libraries are integrated into every device release.
- Large community: Swift has one of the most active and rich open-source communities. Also, there are a lot of resources to help you learn the language.
Swift cons#
- Relatively new language: Swift is still a young language. This means that some of its capabilities and resources aren’t as robust as other programming languages.
- Weak cross-platform support: While Swift does support all Apple platforms, Linux, and Windows, it works best for native iOS development.
- Frequent updates: Swift is a newer language and has frequent updates. This can make it hard to find the right tools to help with certain tasks.
- IDE support: Xcode, the official Apple IDE, falls short in certain support areas, including syntax highlighting, autocomplete, refactoring, and compiling.
Prerequisites for learning Swift#
Swift was designed to be approachable, but having a bit of context before you start can make the learning experience much smoother.
If you’re completely new to programming, don’t worry, Swift is one of the better languages to begin with. That said, it helps if you’re already familiar with basic programming concepts such as variables, functions, and control flow. Even a small amount of experience in languages like Python or JavaScript can give you a useful head start.
Since Swift is primarily used for Apple development, having access to a Mac and a basic understanding of how development environments work, especially Xcode, will also be helpful. You don’t need to master the tooling right away, but being comfortable navigating an IDE will save you time as you progress.
If you’re starting from scratch, you can still follow along. Just expect to spend a bit more time getting familiar with foundational concepts before diving into full app development.
Swift vs Objective-C#
Objective-C is a general-purpose, object-oriented programming language. It was the primary programming language used for OS X and iOS development before Swift came along in 2014. It combines features of C and Smalltalk. After the creation of Swift, Objective-C began to decline in use and popularity, although existing apps written in Objective-C will still need to be maintained.
So, what makes Swift the better choice?
First, it’s important to note that Swift is not the direct successor to Objective-C. Both languages have different capabilities and can be used together for mobile app development. Let’s look at a side-by-side comparison of the two languages.
Swift
- With Swift, you can develop in Xcode, Swift Playgrounds, Cocoa Touch, and more.
- As of now, Swift requires at least iOS 7. This means that iPhones and iPads developed before 2014 won’t be compatible with your apps.
- Swift is a modern, human-friendly language with a simple syntax, which means that the speed of coding is faster.
- According to Apple, Swift is 2.6 times faster than Objective-C.
- Swift has rich documentation that is constantly updated.
- The demand for Swift developers is increasing.
Objective-C
- With Objective-C, you mainly develop in Xcode.
- Your apps will run on any available version of iOS.
- Using Objective-C typically results in a decreased speed of coding because the language isn’t as intuitive and human-friendly.
- Objective-C is 2.6 times slower than Swift, and it takes longer to write because of its more complex syntax.
- Objective-C has rich documentation that isn’t updated frequently.
- The demand for Objective-C developers is decreasing.
Overall, Swift is a more desirable language to choose because it’s safer, faster, more intuitive, and interactive. Swift has Objective-C interoperability, which means that Swift code can live alongside existing Objective-C files. With Swift, you’ll also have complete access to Objective-C APIs.
Continue your journey into Swift for free.#
Our Educative Free Trial allows you to get hands-on with Swift programming for free. Once you’re done, browse through hundreds of other curated courses to continue taking your programming skills to the next level.
Introduction to Swift syntax#
Swift is known for its simple and intuitive syntax. Let’s take a look at some of the Swift syntax basics:
Hello World#
In Swift, a Hello World! program is simple. It can be done in one line, and you don’t need to import any libraries or additional functionalities. Swift also doesn’t require semicolons at the end of statements.
Variables and constants#
In Swift, you use var to make a variable and let to make a constant. Variables and constants need to have the same type as the value you want to assign to them.
You don’t have to explicitly write the type. If you provide a value when creating a variable or a constant, the compiler can infer what type it is. For example, the compiler will infer that ourVariable is an integer because its value is set to an integer.
If you want to convert a value to a different type, make an explicit instance of the desired type.
There’s an easier way to include an integer in a string. You put the value in parentheses, and then put a backslash before the parentheses.
Arrays and dictionaries#
You can create arrays and dictionaries using brackets. You access elements by putting the index or key in the brackets. Your array will grow automatically as you add new elements.
Build your first Swift program: a simple task manager#
Learning syntax is helpful, but Swift starts to click when you actually build something. A great way to get comfortable with the language is to create a small, practical feature from scratch.
Let’s build a simple command-line task manager.
The goal is straightforward. You’ll create a program that lets users add tasks, view all tasks, and mark tasks as complete. This might seem simple, but it introduces you to many core Swift concepts in a realistic way.
Start by defining a basic data structure to represent a task. Each task can have a title and a completion status. In Swift, this is a great opportunity to use a struct, which is commonly used for lightweight data models.
Once you have your task structure, create an array to store multiple tasks. Swift’s arrays are flexible and automatically grow as you add new elements, making them ideal for this kind of use case.
Next, implement simple functions for adding and displaying tasks. You’ll practice working with functions, loops, and conditionals as you build out this functionality. As you expand the program, you can add features like marking tasks as complete or filtering pending tasks.
If you want to take this a step further, try converting this into a basic iOS app using SwiftUI. Instead of printing tasks to the console, you’ll display them in a list view and handle user interactions through buttons. This is where Swift transitions from a language you’re learning into a tool you’re using to build real applications.
By the time you finish this mini-project, you’ll have a much clearer understanding of how Swift syntax translates into real-world development.
Next steps: how to go from Swift basics to real app development#
Now that you’ve explored what Swift is and how its syntax works, the next step is turning that knowledge into real-world skills.
The most effective way to improve is by building progressively more complex projects. After completing a simple program like the task manager, you can move on to building small iOS applications. Focus on understanding how Swift integrates with frameworks like SwiftUI or UIKit, as these are essential for creating user interfaces.
Another important area to explore is working with APIs. Most modern applications rely on external data, so learning how to fetch and display data from an API will significantly expand what you can build. This also introduces you to concepts like asynchronous programming and error handling in a practical context.
You should also spend time understanding core Swift concepts in more depth. Topics like optionals, protocols, and memory management play a major role in writing production-quality Swift code. As your projects grow, these concepts become increasingly important.
If your goal is to become job-ready, consider following a structured learning path that walks you through real-world app development scenarios. Hands-on courses and guided projects can help you move faster and avoid common pitfalls.
Swift is a language that rewards practice. The more you build, the more intuitive it becomes.
Frequently asked questions about Swift programming#
What is Swift used for in real-world development?#
Swift is primarily used for building applications on Apple platforms, including iOS, macOS, watchOS, and tvOS. Developers use Swift to create mobile apps, desktop software, and even backend services. Many well-known apps, such as LinkedIn and Lyft, rely on Swift for their iOS applications.
Is Swift a good language for beginners?#
Yes, Swift is considered beginner-friendly because of its clean syntax and strong safety features. It was designed to reduce common programming errors, making it easier for new developers to learn. Tools like Swift Playgrounds also provide an interactive way to get started.
How long does it take to learn Swift?#
The time it takes to learn Swift depends on your background. If you already have programming experience, you can learn the basics in a few weeks. Becoming comfortable with building full applications, however, typically takes several months of consistent practice.
Is Swift only used for iOS development?#
While Swift is best known for iOS development, it is not limited to it. Swift can also be used for macOS apps, server-side development, and even cross-platform projects. However, its strongest ecosystem and tooling support are still within Apple platforms.
What is the difference between Swift and Objective-C?#
Swift is a modern programming language designed to be safer, faster, and easier to read than Objective-C. While Objective-C is still used in legacy systems, most new Apple platform development is done in Swift due to its simplicity and improved performance.
Do I need a Mac to learn Swift?#
For iOS development, having a Mac is highly recommended because Xcode, the official development environment, is only available on macOS. However, you can still learn basic Swift syntax using online tools or Swift Playgrounds.
Wrapping up#
Congrats on taking your first step with Swift! Swift is a general-purpose, open-source programming language mainly used for native iOS and macOS development. Many of the apps on the app store are written in Swift. Swift is growing in popularity, so it’s a good time to learn the language. We covered some of the basics today, but there’s still so much more to learn about Swift programming, such as:
- Property wrappers
- Constants
- SwiftUI
To get started learning these concepts and more, check out Educative’s course Swift Programming for Mobile App Development. In this hands-on course, you’ll cover topics ranging from arrays, dictionaries, integers, object-oriented programming, error handling, and more. By the end, you’ll have the foundational knowledge you need to begin diving deeper into Apple-based app development.
Happy learning!
