Let's say you commit a change that makes an application 0.05% slower. No big deal, right? Well, at the scale of Meta, it is a big deal--a small slowdown for a large application can waste thousands of servers. It's such a big deal that Meta needs a way to catch these performance regressions and reliably figure out if an ... See more

Coding is so much easier when you think in terms of invariants One good actionable way of doing this is adding assertions in your code And this is why strong type systems are effective, you can encode and enforce invariants within types https://t.co/kke8HCJj4a