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When your application suddenly fails at 3 AM, logs will be your best friend the next morning. But until this happens, we often treat logs as an afterthought. Sometimes there is a discussion on log levels or wording of the message, but we rarely go beyond that. After all, what's so interesting in pushing out a bunch of letters, perhaps with some additional metadata, which we will not use 95% of the time? The Elixir Logger module has us covered well. It's a solid foundation for our basic logging needs.

When managing Docker containers, effective logging is essential for troubleshooting, monitoring, and ensuring compliance. Mismanaged logs can lead to disk space issues, performance bottlenecks, and lost diagnostic data. Here's a quick breakdown of what you need to know: Choose the right logging driver: Options include json-file (default), syslog, journald, fluentd, and none. Each has unique benefits depending on storage, performance, and integration needs.

Sealed classes are a special kind of class in Kotlin, used to create restricted hierachies — where the full list of sub-classes is strictly limited, and known in advance. This is particularly useful when we want to enhance the power of Kotlin’s when statement, model a type that has a fixed set of possible variations, or represent a fixed group of states or outcomes (such as network responses, UI states and form validations).

It’s one thing to build an app. It’s another to make sure it actually works the way people expect – on real iPhones, in the wild, under all kinds of conditions. That’s where iOS app testing comes into play. Crashes, broken layouts… these are the kinds of things that can tank your reviews fast. If you want to avoid that, you need to test the app properly. And that’s exactly what we’re going to walk you through in this short guide.

Jetpack Compose is Android’s modern UI toolkit. It unifies and simplifies the experience by consolidating state and logic in the rendering with a more declarative approach. Among its most notable features is a powerful animation framework that helps developers create fluid and performant animations with ease. Jetpack Compose allows you to easily inject animations into your UI, which is a great way of providing visual feedback and enhancing interactions that directly affect the user experience.

Swift extensions are one of the most useful tools in iOS development, allowing us to add new functionality to existing types without subclassing or rewriting code. In this guide, we’ll break down how extensions work, why they matter, and how to use them effectively. You’ll learn: By the end, you’ll know how to use extensions to write cleaner, faster, and more maintainable Swift code.