DEV Community: Victor Lopes

JUnit Architectural Analysis

Victor Lopes — Mon, 07 Jul 2025 09:19:17 +0000

JUnit 5 uses a microkernel architecture. The platform does not execute tests. Instead, it defines an SPI and delegates execution to TestEngines, each responsible for discovering and running its own type of tests.

In my article, I explain how this architecture works underneath, from loading the engines to execution via the execution tree.

https://medium.com/@Victorldev/architectural-analysis-of-junit-d9472f9bf79b

Automating Flutter Apps: An Introduction to CI/CD Pipelines

Victor Lopes — Fri, 30 May 2025 09:03:12 +0000

The more manual your development process is, the higher the risk of errors, delays, and broken releases.

That’s where CI/CD pipelines come in. They automate the entire workflow:
🔧 Testing
✅ Validation
📦 Build
🚀 Deployment

The result?
✔️ Fewer errors
✔️ Faster delivery
✔️ Code always ready for production

In this article, I explain — in a simple way — how a CI/CD pipeline works and why it’s a must-have in modern software development.

👉 Read the full article here: https://medium.com/@Victorldev/automating-flutter-apps-an-introduction-to-ci-cd-pipelines-197919d0e886

The basics you need to know about widget lifecycle

Victor Lopes — Fri, 23 May 2025 09:29:37 +0000

🚀 Mastering Flutter Widget Lifecycle

As Flutter developer, understanding widget lifecycle is crucial for building high-performance, memory-efficient applications.

Key Lifecycle Methods

✅ initState() - Initialize controllers, subscriptions (called once)
✅ didChangeDependencies() - React to inherited widget changes
✅ didUpdateWidget() - Optimize rebuilds by comparing old/new props
✅ dispose() - Critical for preventing memory leaks (always free resources!)

In my last article, I explain in a simple and practical way when each one is called and how to use them correctly.

👉 Read the full article here: https://medium.com/@Victorldev/manipulating-lifecycle-of-stateful-widgets-in-flutter-e894a83d7bf0

Asynchronous builders in Flutter: Analyzing FutureBuilder and StreamBuilder

Victor Lopes — Fri, 16 May 2025 10:49:22 +0000

I just published an article on how to use FutureBuilder and StreamBuilder in Flutter to simplify asynchronous operations. These builders eliminate repetitive code and make your UI more responsive, without complications.

If you're tired of managing setState manually or dealing with nested callbacks, it's worth checking out.

🔗 Read here: https://medium.com/@Victorldev/asynchronous-builders-in-flutter-analyzing-futurebuilder-and-streambuilder-d3f8af3af88a

Understanding Future and Stream in Dart

Victor Lopes — Sat, 10 May 2025 01:37:45 +0000

Do you know the difference between Future and Stream in Dart?

Both handle asynchronous operations, but have different purposes:

Future: returns a single value in the future.
Stream: returns a sequence of values over time.

In this article, I show practical examples of each and explain when to use one or the other in your Flutter app or Dart project.

📚 Read here: https://medium.com/@Victorldev/understanding-future-and-stream-in-dart-cba0842a8470

dart #flutter #async #stream #future

Create dynamic interfaces with SDUI (Server-Driven UI) in Flutter 🚀

Victor Lopes — Fri, 02 May 2025 10:44:03 +0000

In this article, I explain how to adopt SDUI in practice, controlling your UI directly from the backend.

✅ JSON-based rendering
✅ A/B testing with variants
✅ Simple parser in Flutter

Ideal for those who want to scale their app and gain deployment flexibility!

👉 Read the full article: https://medium.com/@Victorldev/dynamic-interfaces-with-server-driven-ui-for-mobile-bf934b8b3c4f

Inversion of Control (IoC) Principle

Victor Lopes — Sat, 26 Apr 2025 01:26:56 +0000

I was recently asked this question, and since I have little knowledge about it, I decided to study and write an article talking about the fundamental difference between them, which is Inversion of Control. I recommend it, I tried to be brief.

🔗 link: https://medium.com/@Victorldev/inversion-of-control-ioc-principle-a8b8a79e1e01

Understanding keyword Yield in Dart + Examples in other languages

Victor Lopes — Fri, 18 Apr 2025 22:06:13 +0000

Understanding `yield` across languages (with examples)

The yield keyword might look simple — but it hides a lot of power.

In my latest article, I explain how yield works to create generators, which let you produce values lazily and pause/resume function execution.

Even better: I show how yield behaves across multiple languages, with real code examples in:

Dart
JavaScript
Python
C#
Java (yes — Java has a yield too, in switch expressions)

Whether you're new to yield or just want to see how different languages implement the concept, this article is for you.

📖 Read it here: https://medium.com/@Victorldev/understanding-keyword-yield-in-dart-examples-in-other-languages-ae0feef81ccf

The Factory Constructor in Dart and Flutter

Victor Lopes — Fri, 11 Apr 2025 09:33:25 +0000

Have you ever seen the factory keyword in Dart and wondered why or when to use it?

In my article I talk about this.

📖 Read the full post here 👉 https://medium.com/@Victorldev/the-factory-constructor-in-dart-and-flutter-8adb8150ba4b

Native State Management in Flutter

Victor Lopes — Fri, 04 Apr 2025 09:35:51 +0000

🚀 Flutter State Management: ValueNotifier & ChangeNotifier

If you're just starting out with Flutter or want a lightweight solution for managing state, ValueNotifier and ChangeNotifier are great options!

In my new article, I explain these concepts in a simple and practical way, with examples that you can apply directly to your code.

💡What will you learn?
✅ How ValueNotifier Works and When to Use It
✅ How ChangeNotifierWorks and When to Use It
✅ Practical examples, from basic to advanced

📖 Read the article here 👉 https://medium.com/@Victorldev/native-state-management-in-flutter-b44ca610f0df