About 3 months ago, Ryan Dahl (the inventor of Node.js) gave a talk in JSConf called “10 Things I Regret About Node.js”, were he regrets several design decisions he took over Node.js. About during the half of his talk, he showed us an experimental prototype called Deno that aimed to…

Testing RxJS might be a hard task, specially when we have a complex pipeline with lots of time assertions. In this article we’ll explore how can we make these tests easier to reason about using Marble Diagrams, but first: What are Marble Diagrams? Marble Diagrams are visual representation for events emitted over the time…