Re: [elpa] externals/consult 4aa49ee324 3/5: consult--async-pipeline: Convert to function

[Daniel Mendler via "Emacs development discussions." <emacs-devel@gnu.org>]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

>> +  (lambda (sink)
>> +    (seq-reduce (lambda (s f) (funcall f s)) (reverse async) sink)))
>
> Hmm... Haskell/OCaml have `foldr` and `foldl`, maybe we should also have
> `reduceR` and `reduceL`.

Yes, please. seq-reduce-right/left would be nice to have. See also
cl-reduce which has :from-end.

There is also a lack in some combinators (flip, curry, uncurry, ...)
which are occasionally useful. Also papply and rpapply, since
apply-partially lacks conciseness and sometimes one wants apply the
arguments to the right. Same with cl-constantly.

(papply #'f x)
(apply-partially #'f x)
(lambda (y) (f x y))
(lambda (y z) (f x y z))

(lambda (_) x)
(constantly x)
(lambda (_ _) x)
(cl-constantly x)

Daniel