Daniel Silva wrote:
We think dropping FILTER and MAP is pretty uncontroversial; (filter P
S) is almost always written clearer as a DO loop (plus the LAMBDA is
slower than the loop). Even more so for (map F S). In all cases,
writing the equivalent imperative program is clearly beneficial.
How about using srfi-42 instead of those nasty do loops?
It's pretty clean:
(list-ec (: a lis) (* a a))
is equivalent to
(map (lambda (a) (* a a)) lis)
Before I discovered srfi-42, my code often had hideous things like:
(append-map
(lambda (item)
(map
(lambda
(inner)
(* inner inner))
(cdr item)))
lis)
to return (1 4 9 16 25 36 49 64 81) for
a lis that's '((a 1 2 3) (b 4 5 6) (c 7 8 9))).
This becomes even neater:
(list-ec
(: item lis)
(: inner (cdr item))
(* inner inner))
Have a happy first of april!
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