Effective Kotlin
@EffectiveKotlin
Profile of the Effective Kotlin book by @marcinmoskala
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Making animations in Compose is easy! Let’s overview everything you need to know to make your applications stunning. ☺️🪄
Our very own Marcin Moskala will be speaking at @droidcon London 2025 (linkedin) / @dclnd (X)! 🎤 He’ll be sharing his expertise in two talks: 1️⃣ Structured Concurrency: The paradigm shift that changes modern development 📅 30.10.2025 | ⏰ 10:30 – 11:10 2️⃣ Understanding…
You’re not alone in your coroutine questions. Being left on your own with confusion means patching problems without ever feeling sure you understand them. In Coroutines Mastery, you don’t just get answers—you learn in a structured way that makes the questions disappear.
Being a youngster programmer, I was always told that reflection is slow and should be avoided, but I just couldn't observe this slowness in any real measures. That is why I decided to make some benchmarks to see how reflection really performs and write it all down in this…
To turn a function into a flow that emits its result, you can just use flow builder with emit. Many projects define a function for that. You can also turn a lambda function using asFlow. If you’d like to go beyond these small tips and really master flows and coroutines, join my…
Do you have operations in composables that kill your application performance? ☠️ Composable functions can be executed many times, sometimes with every frame. If such composables include any complex calculations, they will be recalculated unnecessarily again and again. The…
Why is Coroutines Mastery built as a cohort course? Learning from scattered blogs and videos gives you fragments. You solve one issue but don’t understand the principles—and the next time, you’re stuck again. 👉 Secure your seat → shorturl.at/hVaPP That’s why Coroutines…
People seem surprised that LLMs behave like people. I guess it is because of the misleading term "Artificial intelligence". No one would be surprised if a more appropriate term were used, such as "Pretended human response".
New conference talk recording 🎥 At JavaZone 2025, Marcin Moskala explored one of Kotlin’s trickiest but most powerful features: variance modifiers. We all use them daily (collections, functional types…), but most developers don’t fully realize how much they impact our code.…
There is amazing interoperability between Kotlin Coroutines and RxJava/Reactor❗
One of the key concepts of Jetpack Compose is type stability. Stable types allow better recomposition optimisations. That was traditionally very important, but since 2.0.0 a lot has changed. Let me explain 👇
When you start multiple coroutines, you can await them all using joinAll(), but did you know you can also use coroutineScope? It awaits all its children's completion. Did you know that? What pattern do you prefer? We explore patterns like this in depth during my Coroutines…
Coroutines Mastery includes live Q&A with Roman Elizarov & Vsevolod Tolstopyatov (2 sessions each) plus regular sessions with Marcin Moskala. A unique combo of deep insights, practical solutions & expert support. Starts Nov 3. Join now 👉 → shorturl.at/KR5tm
Operators in Kotlin can be used not only with primitives and strings, but also with other classes BigDecimal, collections, date and time, and much more.
Here is my list of the most hated coroutines-related mistakes. Do you have them in your project? If you are interested in exploring coroutines join me for the upcoming Kotlin Mastery course 👇 coroutinesmastery.com/?utm_source=x&…
Building AI agents for one platform is tough. But what if you could ship the same agent to JVM, Android, iOS, JS, and even WASM—without rewriting it five times? @Ololoshechkkin new deep dive shows how Koog makes truly multiplatform AI possible (and why it matters). 👉 Read it…
What often looks like “power” ends up as boilerplate and complexity. In this article, Marcin Moskala breaks down real-world code samples to show why #Kotlin #Coroutines and Flow give you cleaner, more intuitive solutions. 👇 kt.academy/article/corout…
Kotlin Coroutines offer first-class support for structured concurrency. This is way beyond explicit structured concurrency in Java, and way easier than Reactor, which requires a good understanding of so many functions to make even simple things. Dive deeper into coroutines with…
The simplest way to display Android fragment in Compose is using AndroidFragment, which looks amazing, but has two dirty secrets you must know before using it. 🤫
derivedStateOf body can only observe state, it cannot observe other values! If you use any value that is not a state, and that might change, you must include it as remember key to create new derived state when it changes!
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