Plurrrr

I've long been an enthusiastic user of print based debugging, although I did eventually realize that I reach for a debugger when dealing with certain sorts of bugs. But print based debugging is eternally controversial, with any number of people ready to tell you that you should use a debugger instead and that you're missing out by not doing so. Recently I had a thought about that and how it interacts with how much programming people do.

This article is about how to filter unique items from heterogeneous lists on the type level in Haskell. This example, without further context, might look a bit esoteric by itself, but I learned a lot writing it and wanted to share the experience.

Sometimes, while working on macOS, you may find the need to test something quick on Linux, or use some utility that's only available on this OS. But, of course, you don't want to go through all the process of creating the VM from scratch.

The good news is, you don't need to! Using krunvm you can create and start a microVM from a regular container image (that is, an OCI image), in just two commands and a couple of seconds.