Recently I incorporated a new technique into my workflow: using inline-snapshot-tests as both a REPL and a documentation tool. The idea is summarized in: 1. [What if writing tests was a joyful experience?](https://blog.janestreet.com/the-joy-of-expect-tests/) 2. [My Kind of REPL](https://ianthehenry.com/posts/my-kind-of-repl/) Basically you write a test that inline encodes the expected output of a function, and then you run the test. If the output doesn't match, the test fails and you get a diff of the output. Some tools can automatically update the snapshot for you, so you can use it as a REPL. This is a great way to document your code, as you can see the input and output of a function right next to it without leaving the editor. In Rust, I use [insta](https://docs.rs/insta/0.16.0/insta/) for this purpose. You can check out an example [here](https://github.com/poga/rust-scratchpad).