GNGidudu Nicholasinfreecodecamp.org·4d ago · 28 min readHow to Test Flutter Apps: Unit, Widget, Golden, and Integration Tests ExplainedThe first time I was asked "what's your test coverage?" in a technical interview, I didn't have a good answer. I had shipped a couple of real Flutter apps by then. They worked and users were using the00
GNGidudu Nicholasinfreecodecamp.org·Jul 8 · 15 min readHow to Fix App Jank: A Practical Guide to Profiling Flutter Apps with DevToolsFlutter makes it fast to build beautiful UIs. That speed is one of the framework's greatest strengths, but it also creates a subtle problem: performance issues are easy to introduce and difficult to f00
GNGidudu Nicholasinfreecodecamp.org·Jun 25 · 21 min readAdvanced Dart: Learn Asynchronous Programming with Streams, Isolates, and the Event LoopI had been writing Flutter apps for over a year before I actually understood how Dart handles concurrency. I knew how to use await. I knew FutureBuilder and StreamBuilder well enough to get things wor00
GNGidudu Nicholasinfreecodecamp.org·Jun 23 · 30 min readHow Flutter Renders Under the Hood: BuildContext and Element Tree ExplainedThe first time I saw "Looking up a deactivated widget's ancestor is unsafe" in a stack trace, I genuinely didn't know what it meant. I copied the error into Google, found three different Stack Overflo00
GNGidudu Nicholasinfreecodecamp.org·Jun 20 · 17 min readHow to Handle Errors the Right Way in Flutter: A Practical Guide to Sealed Classes, Records, and Result TypesI used to think I was handling errors well in my Flutter apps. I had try/catch blocks everywhere. I was catching exceptions, logging them, and showing error messages to users. It felt solid. Then I st00