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Observer Pattern: The Hidden Magic Behind Flutter State Management

When I first started learning state management in Flutter, it honestly felt like magic. I'd change one variable, call setState , and the screen would just… update. Later I met ValueNotifier and ValueListenableBuilder , and it got even stranger — now only one widget would rebuild while everything around it stayed perfectly still. I hadn't written any code to watch for changes. I hadn't wired anything up. It just worked. And anything that "just works" without me understanding why makes me a little uncomfortable. So I did what any curious developer does: I went down the rabbit hole. I wanted to know how a value "knows" when to tell the UI to rebuild. Who is listening? How does the change travel from my variable to the pixels on screen? That question led me to something much bigger than Flutter — a classic software design pattern called the Observer pattern . Once I understood it, the magic didn't disappear. It just turned into some...
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Keep Your Promises: The Liskov Substitution Principle Made Simple

If you're learning clean code, you'll keep running into the "SOLID" principles. The L stands for the Liskov Substitution Principle (LSP) — a scary name for a genuinely simple idea. This guide starts from zero, so no prior knowledge is needed. What it is The Liskov Substitution Principle says: If something is supposed to work like a certain type, then any "version" of that type must be able to take its place without causing problems. That's the whole thing. If you call something a Doctor , it has to actually behave like a doctor everywhere a doctor is expected. If you call something an ApiClient , it has to behave like one everywhere. Break that, and your program fails — usually later, in a confusing way. The principle is named after Barbara Liskov, a computer scientist who described it back in 1987. But you don't need the academic version to use it well. First, what does "substitute" mean? This is the word that makes the whole pr...

Managing State in Flutter: A Guide to State Management with MVVM Architecture.

In this blog post, we'll explore efficient state management in Flutter applications using ValueNotifier and EfficientBuilder within the MVVM (Model-View-ViewModel) architectural pattern. The MVVM architecture consists of three key components: Model: Represents the data and business logic View: Handles the UI presentation ViewModel: Manages state and business logic between Model and View In our approach, we’ll be refining the ViewModel by separating its states into a dedicated State class. This ensures that the ViewModel focuses solely on managing logic while the State class handles state representation. Traditionally, in MVVM, the ViewModel is responsible for both state management and business logic. However, by decoupling these concerns, we create a more structured and maintainable architecture. No more talking. Lets, implement it together. 1. Efficient Builder: We are going to use Efficient Builder package for this. So, go to pub.dev. Add the package to you pubspec.yaml file...

Multithreading in flutter!

Now, some of you might be wondering—Wait, what? Multithreading in Flutter? Yes, that’s correct! Flutter is fully capable of handling multithreading. While Flutter primarily relies on the main thread for rendering and performing other tasks, modern mobile processors come equipped with multiple threads, so why not take advantage of them? Some of you may be asking, why do we even need additional threads when the main thread can handle most tasks just fine? And I agree, the main thread can indeed manage a lot of work. However, when it comes to performance-heavy operations like complex computations or intensive data processing, you might notice that your app's UI starts to freeze, or you experience frame drops. This is where multithreading becomes the ideal solution, helping to offload these tasks and keep your UI responsive. Isolates Before diving into multithreading in Flutter, it's essential to first understand Isolates . Unlike traditional multithreading, where threads share mem...