Thanks for the link. Do you know if there is something similar for GNU APL?

Do you think it will be annoying to switch to GNU APL after going through this? I'd rather not spend time learning a proprietary interpreter if there's a viable free software alternative.

EDIT: Have started going through the tutorial using the GNU APL interpreter. I'll see how it goes I guess. 2+5 seems to work the same :)

EDIT 2: akt makes it possible to type the symbols without a special keyboard with GNU APL https://github.com/TieDyedDevil/akt