On 1/5/23 06:11, siiky wrote:
There are some things I would still use SRFI 42 for, at least for now
that I'm new to transducers. For example:
(list-ec (:list x lst1)
(:list y lst2)
(if (even? (* x y)))
(cons x y))
Which is similar to (filter even (map * lst1 lst2)) but more
performant because there's no intermediate list. I have no idea how to
do this with transducers.
I think the easiest way for this would be to just zip the list together:
(transduce list-fold
(compose
(zip-list lst2)
(filter (lambda (p)
(even? (* (car p) (cdr p))))))
collect-list
lst1)
Thoughts?
--
Jeremy Steward
