Top 15 Swift 5 Features to Use During iOS App Development

It is very important to check the code before it goes for production, swift check the code and remove the entire unsafe code. Other feature is a swift object can never be nil; it will generate an error as soon as you write the bad code. Swift also has limited support for attributes, metadata that is read by the development environment, and is not necessarily part of the compiled code. Like Objective-C, attributes use the @ syntax, but the currently available set is small. One example is the @IBOutlet attribute, which marks a given value in the code as an outlet, available for use within Interface Builder (IB).

swift vs objective c performance

At the same time, the language was listed among the top 10 “most wanted” technologies. Today, we’ll have a look at some of the major changes and new features in Swift 5. We’ll also discuss how the process of making changes to the Swift language actually works, and why every iOS developer should know about it. If you provide a value when creating a variable or a constant, the compiler can infer what type it is.

Playgrounds and Read-Eval-Print-Loop (REPL)

This means that when you make a copy of something with that type, you know it won’t be modified elsewhere. Simple syntax- Swift provides simple and easy to use syntax which exactly developers expect. Swift’s syntax features allow you to write more expressive code. Swift has used objective-C features like null ability and generic which makes the swift code safer and cleaner.

It introduced a stable version of the application binary interface (ABI) across Apple’s platforms. That was a giant step toward helping developers use Swift on dedicated OSs like iOS, macOS, tvOS, watchOS and upcoming iPadOS. The update also brought renewed documentation, updated CLI Xcode 10.2, and binaries for Ubuntu. Swift also became backward compatible with its previous versions. The list of languages that it is interoperable with now includes Ruby, Python, and JavaScript.

If you are interested, check out this SE – 0217, a rejected proposal about the bangbang operator !! Now, let us discuss about what is Swift 5 and what are its features. After the Objective-C, Swift was originally the ‘second’ language for apps in the Apple ecosystem. But as Swift is open-source, it can be used on a number of other platforms, especially Linux. The features in Swift have been designed in a manner so that the can work together to create a powerful language which is fun to use.

Features Of Swift Programming Language

It also provides object-oriented features such as classes, protocols, and generics, giving Cocoa and Cocoa Touch developers the performance and power they demand. Another safety feature is that by default Swift objects can never be nil. In fact, the Swift compiler will stop you from trying to make or use a nil object with a compile-time error. This makes writing code much cleaner and safer, and prevents a huge category of runtime crashes in your apps. For these situations Swift has an innovative feature known as optionals. An optional may contain nil, but Swift syntax forces you to safely deal with it using the ?

what are the features of swift programming

There is an even broader range of blogs, podcasts, conferences, and meetups where developers in the community share their experiences of how to realize the great potential of Swift. Using the incredibly high-performance LLVM compiler technology, Swift code is transformed into optimized machine code that gets the most out of modern hardware. The syntax and standard library have also been tuned to make the most obvious way to write your code also perform the best whether it runs in the watch on your wrist or across a cluster of servers. Multiplatform support- Swift is built with multi-platform source compatibility with platforms like iOS, MacOS, tvOS, watchOS, linux, etc. you can create software compatible with all the operating systems.

Swift uses Automatic Reference Counting (ARC) – a technology aimed to add a garbage collector function that wasn’t introduced to iOS before. Languages like Java, C#, and Go use garbage collectors to delete class instances that are no longer used. They are useful to decrease your memory footprint but can add up to 20 percent to CPU.

In a similar vein, Apple’s language also consumes less memory than Objective-C. This has reduced the amount of reference-type data and SDK classes, which consequently has resulted in more efficient memory usage. Swift was introduced to the world in 2014, which seems to be long ago, but the language itself is really only 7 years old, compared to Objective C live since the 1980s. The recent update brought ABI stability across Apple’s platforms, backward compatibility of Swift versions, and renewed documentation. To get started learning these concepts and more, check out Educative’s course Swift Programming for Mobile App Development.

  • Swift is developed in the open at, with source code, a bug tracker, forums, and regular development builds available for everyone.
  • Features such as optional binding, optional chaining, and nil coalescing let you work safely and efficiently with optional values.
  • The Swift playground allows developers, students, and others to learn the Swift programming language without creating any projects.
  • Multiplatform support- Swift is built with multi-platform source compatibility with platforms like iOS, MacOS, tvOS, watchOS, linux, etc. you can create software compatible with all the operating systems.
  • Other feature is a swift object can never be nil; it will generate an error as soon as you write the bad code.

Unfortunately, AppCode still has limited functionality with Swift compared to Xcode, lacking storyboards, app validation, and submission. It shines if you combine plain iOS development with other platforms and languages. Open-source- Swift is developed at, an open-source framework with source code, bug tracker, mailing list, and regular development list. It is handled by a team of developers, they work with the community. Swift has support for all Apple platforms, it makes programming easier, faster, and safer. Swift is a powerful programming language developed by Apple for macOS, iOS, watchOS, tvOS, and Linux.

A big part of making a choice between programming languages is your team’s experience and preferences. If your developers are skilled at Objective-C, having them all migrate to Swift may not be an option. If you don’t have the luxury of postponing your app release until members of your team get comfortable with Swift, you should consider sticking to ObjC.

what are the features of swift programming

After deciding if Swift is good or bad for you, you may ask how to learn it. As any open-source project, Swift has increased in both platforms and people to learn the language from. It is basically a training program that will teach you interactively how to code stuff with Swift. The Swift programming language was initially released in 2014 and was open-sourced at the end of 2015. As a result, more than 600 contributors have joined and are actively improving the language for seamless iOS app development.

what are the features of swift programming

Often referred to as “Objective-C, without the C,” Swift language is in many aspects superior to its predecessor. To get an in-depth comparison of Swift and Objective C, check our separate article. An app development team with in-depth knowledge & customer understanding. So, without any further ado, let’s come straight to the topic and learn Swift programming features with an updated process. This also led to the development of server-side Swift so that it can be used as a back-end language for web services. It’s important to realize that Swift is bigger than just building iOS apps.

Swift code coexists along side your existing Objective-C and C++ files in the same project, with access to your Objective-C and C++ APIs, making it easy to adopt. Much like Swift Playgrounds for iPad and Mac, playgrounds in Xcode make writing Swift code incredibly simple and fun. You can then Quick Look the result from the side of your code, or pin that result directly below. The result view can display graphics, lists of results, or graphs of a value over time. You can open the Timeline Assistant to watch a complex view evolve and animate, great for experimenting with new UI code, or to play an animated SpriteKit scene as you code it.

Swift first introduced dynamic libraries to iOS when it launched.Since the release version 5.0, standard Swift libraries are integrated into every macOS, iOS, tvOS, and watchOS release. That means any app built on those platforms will be smaller, because these libraries are included. With this advancement, stable application binary interface (ABI) was also released. That allows Apple to provide support of Swift across its platforms.