Swift 5.4 – the Swift programming language with new features and updates

Overview about Swift 5.4

Swift 5.4 is the latest version of this programming language since it was created in 2014. It is the smart language product from one of the biggest technology companies in the world– Apple Inc. This programming language is fully compatible with all applications of Apple’s brand. Besides, it includes the open-source LLVM compiler framework. Best of all, it can correspond with the famous language named Objective – C. As a result, it will help each other in order to make your project as perfect as possible. Through many significant improvements, Swift 5.4 becomes extremely smart with a lot of new features and updates. 

Swift 5.4

What are the special features of Swift 5.4? 

First of all, Swift 5.4 comes with many compilation improvements. It allows you to fix any error as well as optimize code in order to make performance better. Not only that, Swift 5.4 also features a wide range of advanced functions and refinements. Which are they?

Swift 5.4 - programming language

Developed implicit member syntax

Not only supporting only one single static member, you are able to make chains of implicit member expressions with Swift 5.4. This is thanks to Swift’s ability to use implicit member expressions. 

In order to help you feel convenient and easy when working with this language, it supported implicit member syntax for simple expressions. For instance, instead of using Color.red, you can use .red to color some text in SwiftUI. 

swift features

This is not compatible with earlier versions than Swift 5.4 when struggling with more complex expressions. For example, in case you expect your red color to look light transparent, you must write:


Functions have multiple variadic parameter

Not as similar as the older versions that you could only have one variadic parameter. Coming to Swift 5.4, things such as: functions, subscripts, and initializers can use multiple variadic parameters. According to that, the only condition is all parameters that follow a variadic parameter have labels. For example, thanks to the development in place, write a function that accepts a variadic parameter storing the number of goals scored within a football match, accompanied with a second variadic parameter of scoring player’s name:

programming language code

Note that provide both sets of values as variadic parameters in order to call that function. Then, making sure that you have to label all parameters after the first:

smart Swift programming language

Local functions now support overloading

Functions in local contexts had been required the ability to overload by SR-10069. In reality, it means nested functions can now be overloaded. As a result, Swift chooses which one to run based on the types that are used.

For instance, in order to create some simple cookies, we might write code like this: 

swift 5.4

Before having the appearance of Swift 5.4, the three add() methods could be overloaded only if they were not nested inside makeCookies(). However, from Swift 5.4, that function is supported in this case as well.

Support Property wrappers for local variables

In the past, Swift 5.1 used to integrate Property wrappers to attach extra functionality to properties according to an easy, reusable way. Notwithstanding, in Swift 5.4, it becomes smarter. Following that, in order to help using Property wrappers as local variables in functions, their behavior got extended. 

For instance, we could write a property wrapper that ensures its value never lower than zero:

programming language features

And especially, from Swift 5.4 onwards, instead of attaching to a property like before, we can use that property wrapper inside a regular function. For instance, if you want to write a game that players can get or lose points yet still keeps score currently, you should write:

swift 5.4

Swift 5.4 integrates a new target option for apps using Swift Package manager. Following that, it lets us clearly declare an executable target. So with users considering using Swift 5.3, this thing is very important. This is because it doesn’t work well with Swift Package Manager –  it would always search for a main.swift file.

Through this variation, you can use @main as soon as you remove main.swift. Of course, to make sure that gets this new functionality, you must specify // swift-tools-version:5.4 in your Package.swift file. 

In conclusion of Swift 5.4

As you can read in our blog, this language includes a lot of advanced and special features compared to earlier versions. Hence, users can activate it very effortlessly and take advantage of it a lot. However, if you get any difficulties when using Swift 5.4, you can ask ArrowHiTech to help you. With more than 14 years in Swift iOS mobile app development, we are sure to resolve any problems and give you the best satisfaction when using our services.