[tombert]

Yeah, at this point for a lot of the more "number heavy" things I do, my first version is generally in Google Sheets to get a rough prototype and to make sure my math is basically correct, and then a port to Julia.

The hyper-interactive nature of spreadsheets makes them kind of genuinely fun to tinker with. You can see results immediately, and you have enough logic (even in just the vanilla cells, not even counting JS or VBA) to implement a lot of algo stuff.