> APL being compiled to Lisp is important, not just because it gives you proper interoperability out of the box, but also because on implementations like SBCL t

> APL being compiled to Lisp is important, not just because it gives you proper interoperability out of the box, but also because on implementations like SBCL this means APL code will get compiled, through Lisp, to native code Except that simd in lisp isn't great and needs to be done mostly by hand[1]; and simd is super important for making apl performant. Also because gc attributes that are good for lisp aren't great for apl. Also because compiling to native code doesn't actually really affect performance of apl, and might actually harm it for larger programs. To be clear, april is a super-cool project, but not because of any of its performance characteristics. > Now I wish I could find something that does the same for J, because I'm sure as hell not going to buy an APL-friendly keyboard. You don't need a special keyboard, just a layout. I don't know how it works on windows (there's an 'IME', I think?) or macos, but x comes with a keyboard layout. I use this: setxkbmap -layout us,apl -variant dyalog -option grp:rwin_switch Which makes it so that holding down the right super key and pressing any key produces an appropriate apl symbol. You may want to use a different key to switch; check 'man xkeyboard-config' and then search for 'Switching to another layout' for other options. Try: modifier key (whatever it is)+r, for ⍴ (rho). 1. https://www.reddit.com/r/lisp/comments/fkfgjn/sbcl_with_simd_how_to_optimize_sseavx2_to_pointer/ https://www.reddit.com/r/lisp/comments/fkfgjn/sbcl_with_simd...