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02:03 ghiu: be
02:03 ghiu: hi
02:03 ghiu: i'm learning racket
02:03 ghiu: a question: the guide says that keyword arguments cannot be used _alon_
02:03 ghiu: *_alone_
02:03 ghiu: must must always be provided with a value
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02:04 ghiu: this makes sense. so, if i want to use a keyword like a flag, i have to pass it a boolean value
02:04 ghiu: example
02:04 ghiu: #:uppercase #t
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02:04 PLT_Notify: racket: master Kevin Tew * 3358ec8 (2 files in 2 dirs): Place-channel path test cases - http://bit.ly/eZwK2j
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02:05 ghiu: question: how come racket internally uses them without arguments? lik #:transparent in (struct)?
02:05 ghiu: shouldn't it be #:transparent #t?
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04:03 kanak: anyone here using emacs to code in racket? could you please describe your setup. thank you.
04:17 bremner_: kanak: I use geiser
04:18 bremner_: I have to go, but you can google, or it is in debian unstable
04:18 kanak: bremner_: thanks. do you also use stuff like quack?
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05:35 (topic) -: Racket -- http://racket-lang.org -- Come to Racket Days: July 23-24 -- logs @ http://racket-lang.org/irc-logs
05:35 (names) -: gabot masm kanak blomqvist ghiu fmu` evhan shofetim petey-away clklein DT`` bremner_ shachaf martinhex Demosthenes jackhill amoe offby1 Fade qha Zorlin mario-goulart Lemonator samth_away Eren em rudybot tildedave Nightwolf cky ohwow ve friscosam danking cow-orker tewk_ zakwilson mattmight _p4bl0 stamourv hyko @ChanServ
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07:41 bremner_: kanak: no, I just use geiser.
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09:42 PLT_Notify: racket: master Sam Tobin-Hochstadt * e7beef3 (1 files in 1 dirs): Remove unused macro. ...
09:42 PLT_Notify: racket: master Sam Tobin-Hochstadt * 7ba2b6e (1 files in 1 dirs): Fix typo.
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10:29 hoeppner: Where can I find something that just lists all the functions in vanilla racket in one place?
10:31 DT``: hoeppner, http://docs.racket-lang.org/reference/doc-index.html
10:31 hoeppner: Many thanks, I was looking in that area unsucessfully for a while.
10:32 DT``: you're welcome.
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11:01 stamourv: kanak: I use quack, and it works pretty well
11:01 stamourv: I've been meaning to try geiser, but haven't gotten around to yet
11:02 stamourv: ask for other minor modes, paredit is a must, and foof's scheme-complete and eldoc support for scheme are nice too
11:02 stamourv: s/ask/as/
11:03 bremner_: I don't know scheme-complete and eldoc, but there is some corresponding functionality in geiser, I _think_
11:08 stamourv: could be
11:08 stamourv: I don't use scheme-complete all that much, but eldoc is kind of nice
11:08 stamourv: you put your cursor over a function call, and it shows you the header of the function
11:08 stamourv: if it's either a standard function, or one that's in an open buffer
11:13 bremner_: hmm. sounds similar, although for several things like (define ), geiser just basically says where it is defined
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11:15 Eren: I have a list of numbers, which represents the position of the vectors
11:15 Eren: I need to mark these positions false, given with this list of numbers
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11:16 Eren: for example, '(1 2 3) (vector "foo"  "bar" 'a 'b), would produce (vector "foo" #f #f #f)
11:16 Eren: the problem is that (vector-set!) does not returns anything, it's void
11:16 Eren: how should I proceed?
11:17 Eren: normaly, I would do it with foldr, but since (vector-set!) does not produce anything
11:17 Eren: it won't work
11:17 Eren: any suggestions?
11:17 DT``: (map (λ (i) (vector-set! v i #f)) '(1 2 3))
11:17 DT``: *for-each
11:18 DT``: that's what I'd do.
11:19 Eren: yeah, but given the notion that map is used, it seems awkward to me
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11:20 Eren: the above implies, until the end of the list, give one element, proceed (vector-set!), add the returned value from (vector-set!) to the list
11:20 Eren: accordingly to docs, (vector-set! vec pos v) → void?
11:20 Eren: s/give/get/
11:21 Eren: isn't it awkward?
11:21 DT``: yeah, I should've used for-each, that doesn't build the list and returns void.
11:21 DT``: (for-each (λ (i) ...
11:22 Eren: DT``: yeah, that will do the trick
11:31 Eren: DT``: http://pastebin.ca/2048663 , thanks :)
11:32 DT``: np.
11:33 DT``: Eren, that's going to modify `board' directly.
11:33 DT``: use vector-copy to make a copy.
11:44 Eren: DT``: oh, okie
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12:23 ghiu: anybody here?
12:23 jonrafkind: yea
12:24 ghiu: hi jonrafkind . a question: the guide says that keyword arguments cannot be used _alone_
12:24 ghiu: his makes sense. so, if i want to use a keyword like a flag, i have to pass it a boolean value like #:uppercase #t
12:24 ghiu: uestion: how come racket internally uses them without arguments? lik #:transparent in (struct)? houldn't it be #:transparent #t?
12:25 jonrafkind: not all keywords need arguments
12:25 jonrafkind: just the fact that the keyword is passed is a signal to the function being called
12:25 jonrafkind: alone means you can't do (define v #:foo)
12:26 jonrafkind: keywords cannot be used as expressions
12:26 jonrafkind: probably the docs should say that instead of 'alone'
12:28 ghiu: how can i then read if a keyword is set or not?
12:30 jonrafkind: im not sure how to do it with a regular function but with a macro you can inspect the syntax to see if its a keyword
12:30 jonrafkind: probably with a regular function you can't use a keyword alone
12:31 jonrafkind: http://docs.racket-lang.org/syntax/syntax-helpers.html?q=keywords#(part._stxkeyword)
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12:35 ghiu: thanx :)
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16:26 PLT_Notify: racket: master Matthew Flatt * 499800d (2 files in 1 dirs): fix typos
16:26 PLT_Notify: racket: master Matthew Flatt * aed7bdf (1 files in 1 dirs): fix gc of ps/pdf/svg cairo-surface stream
16:26 PLT_Notify: racket: master commits e9dd758...aed7bdf - http://bit.ly/fT2frp
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17:40 realitygrill: er, so does anyone know the difference between htdp2e and htdp?
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17:42 stamourv: realitygrill: 2e is more up to date. It makes use of the newer, better, animation libraries of Racket.
17:43 stamourv: It also explains certain things differently, to reflect teaching lessons learned since 1e.
17:43 stamourv: But it's not complete yet, only the first few chapters have been written.
17:43 realitygrill: yeah, I am partway through part 1...
17:43 realitygrill: skipped ahead and saw part 3 was empty
17:45 realitygrill: tbh i am kinda of frustrated with dealing with animating stuff and so wondered if I would be better served by switching back to htdp1 or SICP (which I just got in the mail!)
17:46 stamourv: well, 2e should have plenty of exercises that don't involve animation
17:46 realitygrill: oh, ok. I'm a bit afraid to just skip
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18:51 samth: realitygrill, in what way are you frustrated w/ animation?
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19:13 realitygrill: samth: maybe I'm weird. I just don't really like dealing with images, pinholes, stuff like that
19:13 realitygrill: I should maybe go slower too
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19:29 PLT_Notify: racket: release Matthew Flatt * 4321a1e (1 files in 1 dirs): fix `namespace-attach-module' at phases above 0 ...
19:29 PLT_Notify: racket: release Sam Tobin-Hochstadt * 05260c1 (1 files in 1 dirs): Remove useless propositional clauses.  Thanks to dyoo for test case. ...
19:29 PLT_Notify: racket: release Jon Rafkind * 3549107 (1 files in 1 dirs): better error message when pre: or post: is used incorrectly ...
19:29 PLT_Notify: racket: release Jon Rafkind * 86b781e (1 files in 1 dirs): show an example of define-fun-syntax and using the keywords ...
19:29 PLT_Notify: racket: release Stephen Chang * 8ba2432 (3 files in 3 dirs): fix struct constructor application in lazy racket ...
19:29 PLT_Notify: racket: release Robby Findler * 5030041 (1 files in 1 dirs): fix check syntax's stdout so that it can handle specials ...
19:29 PLT_Notify: racket: release Stephen Chang * 8c26521 (1 files in 1 dirs): fix typo in guide sec 17.3.3 ...
19:29 PLT_Notify: racket: release Sam Tobin-Hochstadt * d938e0c (1 files in 1 dirs): Refactor to avoid duplicated code. ...
19:29 PLT_Notify: racket: release Sam Tobin-Hochstadt * 0d898db (1 files in 1 dirs): Remove unused macro. ...
19:29 PLT_Notify: racket: release Sam Tobin-Hochstadt * 0a8ad31 (1 files in 1 dirs): Fix typo. ...
19:29 PLT_Notify: racket: release Sam Tobin-Hochstadt * 2da100b (20 files in 5 dirs): Remove useless requires. ...
19:29 PLT_Notify: racket: release Sam Tobin-Hochstadt * 4380e6d (1 files in 1 dirs): Use eq? on sequence numbers. ...
19:29 PLT_Notify: racket: release Sam Tobin-Hochstadt * 5255446 (1 files in 1 dirs): Add cache for `resolve-once'. ...
19:30 PLT_Notify: racket: release Sam Tobin-Hochstadt * 6a906b0 (2 files in 2 dirs): Add debugging parameter, and wrappers for unstable/debug. ...
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20:18 (topic) -: Racket -- http://racket-lang.org -- Come to Racket Days: July 23-24 -- logs @ http://racket-lang.org/irc-logs
20:18 (names) -: gabot hussaibi eli realitygrill jonrafkind mithos28 emporas rekahsoft masm blomqvist fmu evhan shofetim petey-away clklein DT`` bremner_ shachaf martinhex Demosthenes jackhill amoe offby1 Fade qha Zorlin mario-goulart Lemonator samth_away Eren em rudybot tildedave Nightwolf cky ohwow ve friscosam danking cow-orker tewk_ zakwilson mattmight _p4bl0 stamourv hyko @ChanServ
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22:07 akashmanohar: Hi al
22:07 akashmanohar: *all
22:07 (nick) akashmanohar -> SingAlong
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22:08 SingAlong: I'm using the HTDP langauage pack and trying to define a proc with variable number of arguments. How do I do it? DrRacket says
22:08 SingAlong: DrRacket says expected name for function's list argument but found keyword
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23:33 PLT_Notify: racket: master Matthew Flatt * 275d4a7 (2 files in 1 dirs): future scheduling fix and tweak ...
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23:33 PLT_Notify: racket: master commits aed7bdf...2177681 - http://bit.ly/hg0ovd
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