Lambda: the Ultimate Design Flaw

[Sunnan]

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!