GitHub (source code for all languages), also linked above.
The GitHub says “50 lines of code” but the largest example is 74 lines excluding whitespace and comments.
Very cool. To be honest most of these languages (except maybe Lisp and BASIC) are pretty awful. I can’t imagine writing anything in them. Especially K. That’s got to result from some form of brain damage…
It’s only 7 bytes of code. !10 returns a list of numbers 0 to 9. 1+!10 adds 1 to each of them resulting in a list [1, 2, …, 10]. Finally /1+!10 applies * verb with scan adverb and returns 123…*10 which is a factorial of 10.
But it processes arrays of numbers in such an elegant way what no other language can compete with it (well, maybe numpy).
Uhm yeah or maybe MATLAB? I mean I mainly like MATLAB because of its unbeatable plotting abilities, but even MATLAB can do prod(1:10). I am very happy to spend 3 extra bytes on that readability improvement!