Effective Kotlin
@EffectiveKotlin
Profile of the Effective Kotlin book by @marcinmoskala
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If you strip composables from all the layers of abstraction, you will see that everything is just Layout and modifiers. Practically everything you see drawn on the screen is drawn by modifiers.
If your team wants an advanced Kotlin deep dive this year, schedule it before holidays: Kotlin Expert — Dec 18–19, live. Under-the-hood Kotlin applied to real tools (mocking lib, serializer, mini DI). Seats are limited; we’ll keep groups small for hands-on work. 👉…
What is the difference between Text and BasicText in Compose? They are both used to represent text, but… 👉 Text is a material component that includes many built-in features, making it easy to create text that looks good and is accessible. 𝐓𝐞𝐱𝐭, 𝐛𝐲 𝐝𝐞𝐟𝐚𝐮𝐥𝐭,…
I hated this Compose rule at first, but now I know it. “Prefer stateless and controlled components” seems very counter-intuitive, but it makes a lot of sense in long run. Let’s start with stateful components, those that manage their own state, and expose parameters like…
Explore how Kotlin’s type system, delegation, and #KSP work under the hood — and how to use that knowledge to write cleaner, more scalable code, at the Kotlin Expert open workshop, 📆 Dec 18–19. 🔥 live online, hands-on Check it here: kt.academy/workshop/expert
I keep meeting teams writing Kotlin that looks fine, but misses what the language really gives you. Kotlin Expert is where we fix that — together, hands-on. We’ll design APIs with correct variance, build small tools with KSP, draw hard lines around reflection, and use compiler…
🚨 Mutable state in Kotlin: Should you use var or mutable val? 🤔 Each has its perks! One boosts the efficiency of adding elements; the other simplifies observability. Beware of pitfalls like defensive copying and thread safety! 🛠️ Master the trade-offs to avoid common mistakes…
Have you ever wondered how libraries like Arrow Lenses actually work? The answer is quite simple, just follow me.
You need to be very careful when using mutable objects in Compose, because their changes do not trigger recomposition. Though there are some mutable objects that are safe to be used, like view models, but when we observe properties of such objects, we need to property transform…
If you’re planning team upskilling before year-end: Kotlin Expert Workshop is open for individuals and teams. 📆 December 18-19, 2025 Team discount available (5+). contact us for details. → [email protected]
One of the most common mistakes I see is an incorrect launch use inside coroutineScope. Let me explain why it makes no sense, and it only confuses readers.
When is a composable considered the same one and when is it considered a different one? Let’s discuss composables identity for a moment. 🤔
Enum can do more than you know! They can have constructors, bodies, and methods. There is also the Enum type, which is a supertype of all enums. Let me explain it all briefly 👇🧵
If you want cleaner public APIs, fewer edge-case bugs then you need: 💪 A mental model for variance that prevents subtle runtime surprises. 💪 Confidence to use (or reject) reflection deliberately, with measurable trade-offs. 💪 A working KSP processor scaffold you can adapt…
💼 Want Your Company to Pay for Kotlin Training? Here's How! 👇 kt.academy/article/financ…
Those are slides that I use in my workshop, Kotlin Expert. Learn more about annotation processing and KSP from my book, Advanced Kotlin, or my workshop, Kotlin Expert, where we implement our own annotation processor or KSP processor. You can organize it for your company or join…
The way how static dependency injection works is actually very simple, and I can explain it in two minutes! Let me show you 👇🧵
If you are not sure about stability of your classes and parameters, you can use Compose compiler report 📈 It generates a report showing how each class and parameter is treated, and essential statistics related to stability 🔍
Years of using Kotlin taught me, that understanding how things work is the greatest asset for a developer. Such a knowledge gives you solid understanding, opens another level of working with technologies, and opens horizons for making own tools. This is why I created Kotlin…
Here is an overview of different column arrangement options in Jetpack Compose.
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