PostScript struck me as a really nice concatenative language. It has some really...

tromp · on April 13, 2022

I agree; it's also nice for writing little obfuscated signatures, such as

    %!PS                           % -John Tromp http://tromp.github.io/
    /t{dup 1 sub gsave dup 0 gt{[.4 .2 -.2 .4 .4 .2]concat t currentgray
    .8 mul .2 add setgray -1 1 scale t -1 2 translate t 1 -1 scale t[0 1
    1 0 0 2]concat t pop}{0 moveto 1 0 lineto 0 2 lineto closepath clip
    fill}ifelse grestore}def 10 10 translate 600 600 scale 5 t showpage

for producing a pinwheel tiling [1].

[1] https://tromp.github.io/img/pinwheel.pdf

spindle · on April 13, 2022

(As you probably know), Factor comes with a really nice specialised IDE (written in Factor)

protomyth · on April 13, 2022

Actually, I didn't. Thanks for telling me. I don't remember it from the time I looked into it. Is Factor a going concern?

spindle · on April 15, 2022

I don't think anybody's writing anything impressive in it any more, but yes it's a going concern in the sense that fine people are keeping it from bitrotting. :-)