Learn more about Swift

Handling errors in Swift is done using a mechanism where functions specify their ability to throw errors. In modern Swift versions (6.0 and up), functions can even specify the type of the error that the function might throw. When we call a function that can throw, we use special syntax to either ignore the error […]

A new Swift 5.2 feature is the ability to call instances of types as functions. Or, as the Swift Evolution proposal calls it “Callable values of user-defined nominal types”. The very short description of this feature is that it allows you to call instances of any type that has a callAsFunction method implemented as if […]

As developers, we are often told that we should avoid crashing our apps at all costs. It’s why we are told that we shouldn’t force unwrap our optionals, that we should avoid unowned references and that we should never use try! in production code. In today’s article, I would like to offer you a counter […]

If you’re using SwiftUI to build your apps, you will have noticed that your view’s body property is of type some View. The some keyword was introduced alongside SwiftUI and it’s part of a feature called opaque result types (SE-0244). In this post, we’ll take a look at what the some keyword is exactly, which […]

Whenever we write code, we want our code to be well-designed. We want it to be flexible, elegant and safe. We want to make sure that Swift’s type system and the compiler catch as many of our mistakes as possible. It’s especially interesting how Swift’s type system can help us avoid obvious errors. For example, […]

Recently I wanted to build a generic data source layer. This data source would be able to return pretty much anything from a local cache, or if the local cache doesn’t contain the requested object, it would fetch the object from a server and then cache the result locally before returning it to me. To […]

One of those tasks that always throws me off balance is building a form that allows users to upload a form with a picture attached to it. I know that it involves configuring my request to be multipart, that I need to attach the picture as data and there’s something involved with setting a content […]

The Swift team has recently released Swift 5.1. This version of the Swift language contains many cool features like Function Builders that are used for SwiftUI and Property Wrappers that can be used to add extra functionality to properties. This release also contains a feature called Module Stability. But what is this feature? And what […]

If you’re into writing clean, testable and maintainable code you must have come across the term “Dependency Injection” at some point. If you’re not sure what dependency injection is, that’s okay. I will explain it briefly so we’re all on the same page before we get to the main point of this post. Dependency Injection […]

A little while ago I wrote a post about PromiseKit. In this post I wrote mainly about how you could wrap API calls in Promises using the NSURLConnection extension that the creator of PromiseKit provides. Since writing that article I’ve had a bunch of people asking me more about PromiseKit. More specifically, some people wanted […]