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09:32 PLT_Notify: racket: master Jay McCarthy * 91d98aa (3 files in 3 dirs): Fixing drdr discovered problem - http://bit.ly/gIhir9
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13:00 PLT_Notify: racket: master Matthew Flatt * f6d185a (2 files in 2 dirs): configure: use `pkg-config' for libffi
13:00 PLT_Notify: racket: master commits 91d98aa...f6d185a - http://bit.ly/eNX6Bv
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14:28 giantsteps: I have a question about Exercise 27.2.2. in How to Design Programs, would anyone be willing to help?
14:29 giantsteps: I'll post the question in case anyone wants to bite...
14:30 giantsteps: Actuall, maybe a link would be better: http://www.htdp.org/2003-09-26/Book/curriculum-Z-H-34.html#node_sec_27.2
14:30 giantsteps: It gives me to functions and asks me to abstract them. I have a solution, but I don't know if it's any good.
14:31 giantsteps: rather, it gives me TWO functions...
14:35 jonrafkind: so whats your solution
14:35 samth: giantsteps, did you follow the recipe for abstraction?
14:35 giantsteps: Yes, I think. Should I just post all of my code or explain it--or both?
14:36 samth: then it's probably right,. but you should post it
14:36 giantsteps: Ok, it seems overly complex to me, but here goes..
14:37 giantsteps: ;; file->list-of-lines : file -> (listof (listof symbol))
14:37 giantsteps: ;; to convert a file into a list of lines
14:37 giantsteps: (define (file->list-of-lines afile)
14:37 giantsteps: (local ((define NEWLINE 'NL)
14:37 giantsteps: (define first-line
14:37 giantsteps: (local ((define (return-empty first rest)
14:37 giantsteps: empty))
14:37 giantsteps: (trigger return-empty cons)))
14:37 giantsteps: (define remove-first-line
14:37 giantsteps: (local ((define (return-rest first rest)
14:37 giantsteps: rest))
14:37 giantsteps: (trigger return-rest return-rest))))
14:37 giantsteps: (cond
14:37 giantsteps: [(empty? afile) empty]
14:37 giantsteps: [else
14:37 giantsteps: (cons (first-line afile NEWLINE)
14:37 giantsteps: (file->list-of-lines (remove-first-line afile NEWLINE)))])))
14:37 giantsteps: 
14:37 giantsteps: ;; trigger : (X (listof X) -> Y) (X (listof X) -> Y) -> ((listof X) X -> Y)
14:38 giantsteps: ;; takes two functions and produces a function that checks each element of a
14:38 giantsteps: ;; given list against a specified item. If the element is a match, the first
14:38 giantsteps: ;; and rest of the list are given as arguments to the first function supplied
14:38 giantsteps: ;; to trigger. Else, the second function processes the first of the list and
14:38 giantsteps: ;; the recursively processed rest of the list.
14:38 giantsteps: (define (trigger hit-f miss-f)
14:38 giantsteps: (local ((define (trigger l x)
14:38 giantsteps: (cond
14:38 samth: so, you shouldn't post right into irc
14:38 giantsteps: ((empty? l) empty)
14:38 giantsteps: ((equal? (first l) x) (hit-f (first l) (rest l)))
14:38 giantsteps: (else (miss-f (first l) (trigger (rest l) x))))))
14:38 samth: giantsteps, please use lisppaste or pastebin
14:38 giantsteps: trigger))
14:38 giantsteps: 
14:38 giantsteps: Oops, sorry. That's why I asked. I'm a newb. One sec.
14:39 samth: also, if your new definitions of the two functions aren't short, it's probably not right
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14:41 giantsteps: Okay, http://paste.lisp.org/display/121470
14:42 giantsteps: The new definitions are relatively short (they're locally defined), right? It's just the abstract function...
14:42 samth: when you're done with abstracting, you should have 3 functions
14:43 samth: the abstracted function, and the new defintions of first-line and remove-first-line
14:43 giantsteps: Right, so the abstracted function is trigger, the new definitions are local to file->list-of-lines.
14:44 samth: also, why do you have a local defintion that's identical to the whole function?
14:44 giantsteps: You mean with regard to trigger?
14:44 samth: yes
14:45 giantsteps: Because that's necessary in order to output a function. trigger takes a function and yields a function.
14:45 samth: oh, yes, sorry, i was misreading
14:46 giantsteps: One second, I'l post another version that makes my question clearer...
14:48 giantsteps: http://paste.lisp.org/display/121471
14:48 giantsteps: And thanks so much for helping me, I really appreciate it.
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14:51 samth: giantsteps, i don't think the new versions of remove-first-line/first-line have the right contract
14:52 samth: in particular, how many arguments do they have?
14:52 samth: you should write some test cases
14:52 samth: and make sure they work
14:52 samth: with both versions
14:53 giantsteps: The tests worked. They are slightly different: They take the NEWLINE character as an argument (more general).
14:53 giantsteps: So yes, they take two args instead of one.
14:54 giantsteps: In other words, the new versions take a list in addition to a character used to separate lines.
14:54 samth: the new versions are supposed to be exactly like the old versions
14:54 samth: that's how the abstraction recipe works
14:55 giantsteps: Right, then I would just substitute all the xs in the code with NEWLINE.
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14:56 giantsteps: Hmm...
15:00 giantsteps: Anyone else want to take a go at helping me? Was I being a dweeb?
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15:23 collin: hi all..just a little question..if i have some module..we'll say testmod.rkt..if i import it from multiple modules (say a.rkt require testmod.rkt and b.rkt; b.rkt require testmod.rkt)..
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15:25 rekahsoft: so my question is if i have a variable or some data in testmod.rkt and its changed will that change be available to a.rkt and b.rkt? or do a.rkt and b.rkt have different versions of the modules (aka is the module instantiated like an object would be in say C# or java)
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15:26 rekahsoft: my assumtion is no..because you cannot require a file (module) more then once..i assume all the variables, functions, etc are available to whichever module imports them?
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15:32 carleastlund: rekahsoft, modules are instantiated once [per namespace and phase].  Different modules will see the same version of testmod.rkt [unless you do complicated things with namespaces and phases, which you probably aren't if you're asking this question].
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22:47 Seus: question: if i have a hash table with say: 'A, and I want to use a match clause to see if a list starts with 'A (mind you 'A can be completely variable), how do I have match check the entire hash table to see if that particular item is in the hash table and have it run that particular match clause?? I've tried (match expr ((hash-has-key? (first expr) p ...) '(found))) but it doesn't work...error
22:47 Seus: in pattern
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23:16 Fare: Seus: what match clause?
23:16 Fare: You could store a closure in your hash
23:16 Fare: and call the closure if the entry is matched
23:17 Fare: is that what you mean?
23:17 Fare: (let ((fun (hash-get head hash))) (if fun (fun params...) ...))
23:18 Seus: i'm not sure...i'm fairly novice with racket
23:18 Fare: if you don't know what you want, neither do we.
23:18 Seus: i'll have to read what a closure in a hash is to be sure
23:18 Fare: or, do  you mean -- constructing a match statement in a macro?
23:20 Seus: well, i want to say constructing a match statement in a macro
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23:33 Guest32133: hello all have a couple of questoin: a. Is there a way to port mzscheme cards collection to web using moby or related technolgy  b. What needs to be done to use the cards library to create a stand-alone games detached from plt-games
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