Reactive code examples can be mind-blowing. Powerful, succint, robust…they seem to handle many concurrency scenarios without breaking a sweat. But let’s be honest, examples from 30-minute conference talks and short blog posts rarely reflect the messy real world™. In any case, developers get all pumped up about reactive goodness and want to use it in their projects. Alas, they quickly find out that it’s not all reactive unicorns and rainbows, and that thinking of state in traditional programs as a sequence of events is not trivial. I will attempt to shed some light on how to do that by writing a real world example in a few lines of RxJS: An FTP client.

Firefox—my browser of choice—just updated to version 41 beta. It turns out that from this version on, any extension that hasn’t been signed by Mozilla is disabled automatically. Firefox didn’t warn me about that. I had to go to the Add-ons panel to check why some of my extensions were not working, only to find that they were disabled. And I can’t seem to find a place in the UI to opt out and allow unsigned extensions in my browser.

For a long time, an easy way to get access to a Firefox OS phone was to order a Peak or Keon model from Geeksphone. The phone maker jumped on the Firefox OS train early on, offering reasonably priced phones aimed to early adopters.

I’ve been checking out Pyret, the new language from the same guys that made Racket. Even if it is designed to be for education, it has a syntax I love and some really cool features, like the possibility of adding in-line unit tests to your functions.

Code coverage is invaluable to get an overview of how well-tested your app is, and it helps finding new bugs in your code. Unfortunately coverage reports are not ubiquitous in Node.js projects, and because of that it may seem that it is hard to set up, which is not the case at all!