3 ms·

LOOP has the DO functionality included. Example: CL-USER 18 > (do ((a 1 (+ a 1)) (b 10 (* b 1.5)) (c nil))

• medo-bear 2y ago
  You can also express LOOP constructs in terms of DO. However if you were to construct a more exotic iterator that is not so straight forward in LOOP (beware of edge cases), I think it is more reasonable to pick DO. I think also that your example illustrates this.
  • lispm 2y ago
    I would miss the in-order collects, actually collect/maximize/... features, destructuring of lists, direct type declarations, ... I also find DO not easy to read and understand. The code from above I would actually write in LOOP as (loop for a from 1 upto 5 and b = 10 then (* b 1.5) collect (* a b) into c finally (return (list a b c))) I find that to be readable.
    • medo-bear 2y ago
      Of course to each their own. I like LOOP a lot actually when I need to do something familiar, however for something unfamiliar DO is often my choice. It also serves as a caution to tread and think carefully when I return to the code. Sometimes, after a while, I realise how to do the DO construct succintly with LOOP