I agree. I got into the practice after I picked up F#. I used to create simple solutions in the interactive REPL as mainly proof of concepts. Once I had the bas

I agree. I got into the practice after I picked up F#. I used to create simple solutions in the interactive REPL as mainly proof of concepts. Once I had the basics down, I sat down and wrote a list of possible edge cases, expected user inputs, the format of output and the command line interface for the tool. Then I started coding from scratch and had a good and clean working solution ready. Helped me a lot.