Re: What's missing in ELisp that makes people want to use cl-lib?

[Augusto Stoffel]

On Sat, 18 Nov 2023 at 06:58, Gerd Möllmann wrote:

> And of course we're not a millimeter closer to answering the question
> why seq.el should replace cl-lib.

I think the original question was, why do you need an extra library of
basic list processing functions in a LISt Processing language...  Also,
assuming performance is indeed crucial, shouldn't they be implemented in
C?

The vocabulary missing from the built-ins is pretty small.  The
following are the fundamental ones IMO:

- filter aka remove-if-not
- some

(reduce is also academically fundamental, but I guess dolist is the more
idiomatic replacement.)

The following I would count as nice-to-haves:

- drop (already exists under a funny name)
- drop-while (basically like `member' with a different TESTFN)
- take-while
- perhaps find and position (those are small variations on `some')

The rest of seq I would count as "sporadically handy" (seq-partition,
seq-mapn, etc) or "pretty much unnecessary" (seq-difference,
seq-intersection, etc).