JavaScript Advanced: Code That Holds Up in Production

This is for people who already write Node and browser JavaScript with modules, async/await and tests, and now need code that keeps working under real load. You will learn how closures and this really behave, how the event loop orders your code, how to run, limit and cancel async work, how to process data that doesn't fit in memory, how to catch type bugs without switching to TypeScript, and how to ship a package and find slow code and memory leaks. If you skip this level, your code passes every test and still falls over the first week it runs in production.