I am a novice, self-taught programmer. Please forgive this possibly naive question, but what's the problem? The big post I read seems to say this one sentence: different containers are different, but they should act the same.
But, different containers are different for a good reason. Take a linked list. "map" is a well-known operation, taking a procedure and a list, and returning a (possibly fresh) list with proc applied to every element of the original list. Now, take a vector. What does map mean? I can't answer this question. 1) Well, you chose a vector because it is mutable, so map should really be something like map! and return void 2) Well, you chose a vector because it is random-access, so this one exceptional O(n) operation should return a vector for otherwise random-access use 3) Well, you only do something to every element as processing for more doing-something-to-every-element so it should return a list with better filter behavior 4) Well, *I* have no clue what you want, so I'll just create this view called a "sequence" and give you that (oh yeah it just acts like a list) 5) Well, *I* have no clue what you want, so I'll just leave it up to you to make your own map-like function I can't pick between 1 through 3, because I don't know why someone is doing something to every element of a vector (curiosity: why didn't they use a list in the first place?). I don't believe (4) is so much a "solution" as a way to relocate the problem to post-processing of your containter-viewed-through-a-sequence rather than pre-processing by selecting the right function in the first place. (Of course, (5) is not a solution, either, but a refusal to do anything at all.) Can someone please elaborate a bit on why this map-vs-vector-map is a problem? I feel like I am missing something kind of basic here. On Wed, Aug 11, 2010 at 12:46 PM, Eduardo Bellani <ebell...@gmail.com> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > http://programming-puzzler.blogspot.com/2010/08/racket-vs-clojure.html > > Any opinions on the subject? > > - -- > Eduardo Bellani > > omnia mutantur, nihil interit. > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.9 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ > > iEYEARECAAYFAkxi0/cACgkQSbLl0kCTjGnfxQCfTNJwqzEZKeStOgwoIUsqiRnr > HLoAn3r0zWwINnluhSzwDqqCwN0qbssX > =KaS5 > -----END PGP SIGNATURE----- > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
