York Wong

When Mozilla was creating JavaScript there was a bussiness requirement that it should allow Java developers/UI deesigners to use it without spend to much time to learn it Unlike typical developers from C#/Java background, I didn't follow that path, I learned and use JavaScript seriously, understood all its core concepts and avoid its bad parts My strong .NET background gave me the knowledge of the full life cycle of software development and software design priciples, which benefits my day to day front-end development work I have been practicing TDD with Jasmine/Mocha/QUnit and delivering high quality products I enjoy writing functional programming style JavaScript to produce composable and immutable code. I always use const whenever possible, declared less than 10 variables in the past year, which means most of my code is mathematically impossible to get into an unexpected state. I deeply understand the concepts of functor, applicative and monad and use them to avoid null reference exceptions, timing issues and race conditions. Their names are scary but they do natively exist in JavaScript - Array and Promise, but of course you need to use them the right way Performance optimization and JavaScript memory profiling is also my strength

I write clean, semantic HTML and css I have been using Selenium/Ranorex to write automated acceptance tests, a well design HTML structure and css class naming ensures the tests are robust, because the HTML doesn't need to change to much when the visual style requirement changes

I always write testable code. In most of the case start with tests, then implement production code to make the test pass. There are many benefits of doing test first: Get instant feedback as soon as you finish typing Have no fear of changing/refactoring code Code is proven working Enforce clean interfaces in code

C# was my primary language and is my 2nd favorite language. Don't use it too much today but strong .NET knowledge helps me integrating back-end service and web front-end better, as well understand systems development life cycle, design patterns and SOLID pinciples