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04:12 EM03: any good docs with exercises and such for racket?
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06:07 bremner_: EM03: yes, How to Design Programs (look for the second edition)
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09:20 samth: rekahsoft, `define-struct/contract' still works
09:20 samth: `struct' and `define-struct' are just different syntaxes for the same thing
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11:55 seku: http://paste.pocoo.org/show/x8T1nloj0AraZNq9O3O5/ can i improve this somehow?
11:56 ohwow: nah i think you are good
11:57 seku: can i define functions so they take different numbers and types of variables?
11:58 seku: and it automatically chooses which one to use
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12:07 ohwow: seku: like several functions with the same name but with different types of arguments? or just a function which takes different kinds of arguments?
12:08 samth: seku, try using `match'
12:08 ohwow: if latter, you just (define (f a b) (string-append a (number->string b))) ;; (f "asd" 4) => "asd4"
12:09 samth: (define (f x) (match x [(? integer? y) (add1 y)] [(? string? y) (string-append "foo" y)]))
12:09 ohwow: if first, you should look at dynamic dispatching
12:09 ohwow: im not sure how it's done in racket
12:10 ohwow: samth: is it possible to do it `CL-style'? Something like (define (f (integer a) (integer b)) ..) (define (f (string a) (string b)) ..) ?
12:10 samth: ohwow, first, that doesn't work for functions in CL, only for generics
12:11 samth: second, there isn't a normal mechanism for doing that in Racket, but you could look at Swindle
12:11 samth: rudybot, doc swindle
12:11 rudybot: samth: your racket sandbox is ready
12:11 rudybot: samth: not found in any library's documentation: swindle
12:11 samth: http://docs.racket-lang.org/swindle/index.html?q=swindle
12:12 ohwow: o tiny-clos
12:12 ohwow: sorry, i am not really good at CL, i just saw some example code
12:13 ohwow: what's the difference between generics and functions?
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12:13 ohwow: I only heard the word `generics' in the context of C#/Java and I guess it has a different meaning
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12:19 ohwow: samth
12:26 jonrafkind: generics do the vtable lookup for you so you dont pay the cost each time
12:27 jonrafkind: so if you do (send some-obj foo) the class system has to do a dynamic lookup of the 'foo' method, but if you do (define my-foo (generic foo-class foo)) now you can do (send-generic some-foo foo) and that lookup won't be done again
12:28 ohwow: hm
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12:41 Zatman: Hello, is this a place where I can come for some help with a programming problem?
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12:43 jonrafkind: sure
12:44 Zatman: I'm in a Programming Language class where we have to write a Scheme procedure that takes three arguments and returns the sum of the squares of the two largest numbers. I've figured out the logic, but I'm having problems figuring out an error I'm getting
12:45 Zatman: http://zatman.privatepaste.com/ebdab56186 <- that's the code with the error message.
12:46 Zatman: when run in DrRacket with the arguments 1, 2, 3 the whole block from let through the end is highlighted in pink, while the two set! statements are highlighted in black
12:46 jonrafkind: you have too many parentheses around the cond
12:46 jonrafkind: you have ((cond ..)) when you want (cond ...)
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12:46 Zatman: ok
12:47 Zatman: When I remove a set of () I get: "intermediate-let: expected only one expression after the name-defining sequence, but found one extra part"
12:47 seku: why isn't it the same?
12:47 seku: () and (())
12:48 jonrafkind: (x) is procecudure application, if you do ((x)) then you will call (x) and then call whatever its result is
12:48 jonrafkind: the result of his (cond ...) is void, so ((void)) fails
12:48 Zatman: ok
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12:49 jonrafkind: Zatman, try (let ... (begin (cond ...) (- ...)))
12:49 jonrafkind: but probably you should only have one expression after the let isntead of two
12:49 jonrafkind: (let ... (- ...)) orw hatever
12:50 jonrafkind: using mutation (set!) is considered bad form
12:51 Zatman: Thanks, adding the (begin(...) worked
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12:57 PLT_Notify: racket: release Matthias Felleisen * bd94b49 (3 files in 2 dirs): critical bug fix in registration process; please propagate ...
12:57 PLT_Notify: racket: release Matthias Felleisen * 947b39d (1 files in 1 dirs): history updated ...
12:57 PLT_Notify: racket: release commits 8061414...947b39d - http://bit.ly/g38Fke
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13:10 seku: is there a way to make to refer to self from a lambda?
13:11 jonrafkind: you could use a macro to do that, otherwise you need to use letrec or something
13:11 jonrafkind: (letrec ([self (lambda (x) ...(self x)...)]) self)
13:12 seku: thanks. I use define :)
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13:30 Zatman: Thanks once again for the help!
13:31 (quit) Zatman: Quit: bye
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13:54 seku: does racket compile to machine code?
13:54 jonrafkind: eventually it does, it gets JIT'd at runtime
13:54 bremner_: seku: there is a JIT which does
13:55 seku: mmm... does it mean it's being run by java interpreter?
13:55 bremner_: nooooo!
13:55 bremner_: ;)
13:56 bremner_: the J is for Just
13:56 jonrafkind: ROFL
13:56 seku: i don't know what jit it ;) never done java
13:56 seku: im a hobbyist and im looking forward to toying with opengl or something
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13:59 seku: ok
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14:23 seku: drracket word-completes reduce but it gives me unbound identifier error (#lang racket). Is it with some other name?.
14:23 jonrafkind: whats your language set to
14:24 seku: racket
14:24 seku: and it chooses from source
14:24 stamourv: reduce is in srfi/1
14:24 stamourv: you need to require it
14:24 stamourv: or use fold{l,r}, which are in #lang racket
14:25 seku: thanks
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16:08 EM03: I want to use scheme for web dev .....am i crazy? heh
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16:12 realitygrill: me too, that'd be fun
16:18 EM03: you ever tried?
16:21 realitygrill: no, I'm a newb programmer
16:22 realitygrill: but there does appear to be stuff on it in the docs
16:24 qha: I suppose this is what realitygrill is talking about:
16:24 qha: http://docs.racket-lang.org/continue/index.html
16:26 qha: If you like scheme I'd recommend taking a look at the environment for scheme servlets (or rather racket servlets now a days I suppose, what's at that docs link any ways).
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16:30 realitygrill: yes, that's what I meant
16:30 realitygrill: good to know
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16:36 EM03: qha: the only thing that scares me is i think it uses a continuation approach does it not?
16:38 qha: There's an option to use continuations. That's half the reason I started using it, before I was using a scheme program started via cgi, but if you want to share state between requests I expect there are other ways of doing it. If you don't then there's no reason to worry about continuations.
16:52 jonrafkind: ive only used the webserver a tiny amount, but sharing state by using continuations is much better than storing it in a persistent hash table
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16:52 jonrafkind: much better as in you can program as if you were writing a normal application
16:52 jonrafkind: using a hashtable is annoying becuase you have to recreate the control flow of your program each time the user makes a request
16:53 jonrafkind: so obviously one of the things you want to store about the client is the control flow, and this is what the continuation is
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17:12 EM03: qha: so I don't need to use continuations?
17:13 EM03: websites that use continuations don't work well for static content and seo in general
17:14 qha: For static content there's probably no reason to use continuations, but I don't really see the reason to use even cgi for static content.
17:15 EM03: so how would you do it?
17:15 EM03: is there any way I can use continue without using continuations?
17:17 qha: I'd just make Apache httpd serve the directory holding the static content.
17:18 qha: Hmm, it strikes me that static content might still come from a database or what ever else you have that isn't a file system.
17:20 qha: http://docs.racket-lang.org/continue/index.html#%28part._.Inspecting_.Requests%29
17:20 rudybot: http://tinyurl.com/3j2gwdl
17:20 qha: describes how you inspect requests, that should allow you to figure out what your visitors are asking for.
17:20 EM03: hmm there should be some sort of routing dispatcher qha
17:20 EM03: to make things a bit more elegant
17:23 qha: As in you want to make the web server send all requests to what looks like different paths to the same program?
17:25 qha: I think I've seen something like that, but I'm not sure if that was just like plug in your dispatcher here or rather like rebuild the entire web server (using all the components it's built of except the one you're unhappy with), but I expect this is where I saw it:
17:25 qha: http://docs.racket-lang.org/web-server-internal/index.html
17:28 EM03: qha: i'm trying to create a cms qha
17:35 qha: Sorry, I never had an issue with that part of the web server implementation and I can't find a more elegant solution than rebuilding the outermost parts of the server just looking through the second link I just sent right now.
17:36 qha: If I needed something like that in less than a day I'd put an Apache with mod_proxy and mod_rewrite in front of the servlet engine.
17:41 EM03: use mod_rewrite to fake the url system?
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17:52 qha: Pretty much. Pass it in a parameter so all requests can go to the same servlet.
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17:56 EM03: qha: there has to be a way to do this in the server, some sort of dispatch that allows you to map urls to certain functions
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17:59 qha: I agree it would make sense, perhaps if you ask here again another time someone who knows better will see your question or try the mailing list: http://lists.racket-lang.org/users/
18:00 qha: Anyway, I'm of to bed now. Good luck!
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19:15 mithos28: Does anyone know why typed racket cannot generate contracts, when requiring a value of (Channelof Number)?
19:25 samth: mithos28, i'll take a look
19:27 samth: mithos28, it seems that it's not easy to write a channel that dynamically checks its arguments
19:27 mithos28: samth: ok so an implementation fault, not a soundness thing
19:29 mithos28: I'm trying to add support for ephemerons to TR, since it looked (relatively) easy and am looking at channels as my guidepost
19:31 samth: right, not b/c of soundness
19:31 samth: we'd need some kind of contract combinator for channels
19:31 samth: which i suppose could be written using threads and creating a new channel
19:31 samth: but that seems like a bad idea
19:36 mithos28: ok, I'll look at some other type else for guidance on how the contracts are specified. Thanks for the help.
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19:49 samth: mithos28, take a look at Pair -- that should be pretty simple
19:49 samth: although, now that i think about it, i'm not sure how to make contracts for ephemerons work
19:50 samth: you'd need an ephemeron chaperone, and those don't exist
19:52 mithos28: I looked and came to that conclusion aswell
19:52 mithos28: what is the best way to publish a patch when I am finished?
19:57 samth: mithos28, i'd send it to the list, or if you use github, create a pull request and send the link to the list
19:58 mithos28: samth: ok, thanks.
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20:04 EM03: anyone here wanna be my mentor? :)
20:12 samth: mentor for what?
20:19 (nick) samth -> samth_away
20:29 EM03: just kidding samth_away
20:29 jonrafkind: google code
20:29 jonrafkind: EM03, right?
20:30 EM03: huh?
20:30 jonrafkind: ok nevermind
20:30 bremner_: a bit late for gsoc
20:30 jonrafkind: some guy told me he was accepted today
20:31 EM03: I'm being very dumb by getting into scheme like this but it is what it is
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20:37 EM03: any good place with some scheme exercises?
20:39 jonrafkind: htdp.org
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