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06:00 `quote`: hello racket language users
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06:43 bremner: is the racket optimizer getting smarter? I ran a test and a non-tail recursive factorial was actually a bit faster than the tail recursive one, and both could compute (fact 100000) without any trouble.
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07:18 bremner: hmm. I guess it just must be that arithmetic dominates the computation.
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08:12 carleastlund: bremner, a the non-tail-recursive factorial is likely to perform well on a system with low memory usage overall, because it can just grab stack frames when it needs them.  It would slow down a lot if, for instance, the system needed to go to swap space, while the tail-recursive version wouldn't.
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08:40 samth: bremner: matthew explained this once, i think, on the mailing list
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09:06 bremner: samth: well, for e.g. list length, the benefit of tail recursion is obvious.
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09:06 samth: sure
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11:08 asumu: greghendershott: are you missing a few .md files in your wffi examples folder?
11:08 asumu: e.g., google-plus.md
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11:13 greghendershott: asumu: I split the non-Racket-specific portion of wffi into its own project, https://github.com/greghendershott/webapi-markdown
11:14 greghendershott: I thought I updated wffi's README to explain that, but let me double-check ...
11:14 greghendershott: Yeah I did, but sorry if that was confusing.
11:16 asumu: Ah, sorry, that's my reading comprehension there. :p
11:19 greghendershott: I did just notice stupid typo in README.md, extra backtick. Just pushed fix for that, and a couple more commits.
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11:24 greghendershott: BTW I'm working on the server side of things, again. i.e. When you're implementing a web service, using the Markdown spec/doc for "routing".
11:25 greghendershott: But I think under that I want something like Python's WSGI, Ruby's Rack, or Clojure's Ring. So I'm working on that part, first.
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11:28 samth: greghendershott: sweet!
11:29 greghendershott: samth: I might call it "Lob". :)
11:29 samth: ?
11:29 samth: greghendershott: i don't get it
11:30 asumu: greghendershott: woo, I got a simple wffi thing for fetching gists. Now to do the rest of the API.
11:31 greghendershott: samth: In racket sports one lobs things back and forth.
11:31 samth: greghendershott: doh
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11:41 mister_zombie: Hi, I'm new to Racket, and I'm not sure I get contracts too good.
11:41 asumu: mister_zombie: anything specifically?
11:41 mister_zombie: As far as arity is concerned, my contract works, but it doesn't seem to care much about the type of things I'm giving it.
11:42 mister_zombie: (provide (contract-out [x (integer? . -> . integer?)]))
11:42 mister_zombie: (define (x y) 24.2)
11:42 mister_zombie: I would expect this to fail
11:42 mister_zombie: Or at least complain when I call it
11:42 asumu: The way that contracts work, that will only fail when you call 'x' from another module.
11:43 asumu: rudybot: (module foo racket (define (x y) 24.2) (provide (contract-out [x (-> integer? integer?)])))
11:43 rudybot: asumu: your sandbox is ready
11:43 rudybot: asumu: Done.
11:43 asumu: rudybot: (require 'foo)
11:43 rudybot: asumu: Done.
11:43 asumu: rudybot: (x 5)
11:43 rudybot: asumu: error: x: self-contract violation, expected: integer?, given: 24.2 <NEWLINE>   contract from: foo, blaming: foo <NEWLINE>   contract: (-> integer? integer?) <NEWLINE>         at: #<undefined>:1.63
11:43 asumu: Like so.
11:43 asumu: rudybot: (x "not an integer")
11:43 rudybot: asumu: error: x: contract violation, expected: integer?, given: "not an integer" <NEWLINE>   contract from: foo, blaming: program <NEWLINE>   contract: (-> integer? integer?) <NEWLINE>         at: #<undefined>:1.63
11:43 mister_zombie: Ooooooh.
11:44 mister_zombie: Excellent.
11:44 mister_zombie: I like this very much.
11:45 mister_zombie: I think I will enjoy Racket a lot.
11:45 asumu: :)
11:46 didi: mister_zombie: Careful though. It's highly addictive.
11:46 mister_zombie: I can see that.
11:47 mister_zombie: And contracts like that will accept predicates in general, I guess
11:49 asumu: Yeah, any predicate can be used as a contract.
11:50 mister_zombie: Niiiiiiiiiice.
11:50 mister_zombie: And if I define my predicate as a function inside my module it spits out the function name.
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11:51 mister_zombie: Next question: How can I ever feel safe coding without DBC ever again?
11:52 bremner: mister_zombie: you can use Typed Racket instead ;)
11:54 bremner: well, for simple contracts it makes sense anyway. Sometimes complicated conditions are a bit contorted as types.
11:55 mister_zombie: Ya but I mean, I can see the power.
11:56 mister_zombie: You can make sure stuff is used as intended.
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11:59 mister_zombie: There probably is a nice way to deal with contract breakage on the part of the caller too?
12:00 mister_zombie: Anything I should read in that regard? I was up to chapter 4 of the Racket Guide.
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12:14 stamourv: rudybot: doc exn:fail:contract?
12:14 rudybot: stamourv: your sandbox is ready
12:14 rudybot: stamourv: http://docs.racket-lang.org/reference/exns.html#(def._((quote._~23~25kernel)._exn~3afail~3acontract~3f))
12:14 stamourv: mister_zombie: ^
12:14 stamourv: To recover from contract errors.
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12:15 stamourv: Combined with `with-handlers', etc.
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12:20 tim-brown: thanks, anyone there who answered my macro question on the list
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12:22 mister_zombie: stamourv: That looks nice. What's the idiomatic way of binding error handlers?
12:23 stamourv: I usually use `with-handlers'.
12:23 didi: +1 `with-handlers'
12:23 mister_zombie: From the importing code, on any external function?
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12:26 stamourv: Functions usually document the exceptions they raise.
12:26 stamourv: As for where to put the handlers, I'd say it depends on your application.
12:33 mister_zombie: Nice.
12:33 mister_zombie: Quite clean.
12:33 mister_zombie: I like the exn:fail? thingie.
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13:28 asumu: This reminds me, `with-handlers` is another identifier that needs examples in the docs.
13:29 mister_zombie: I'm slowly getting the hang of the way stuff is defined.
13:29 mister_zombie: (in the docs)
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13:30 didi <3 the docs
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13:58 mister_zombie: If I wanna run a very light webserver, should I stick with web-server/servlet-env?
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16:06 dyoo: does anyone here have prior exprience with SDL for Mac OS X?
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16:10 jonrafkind: well of course i have games that use sdl that work on osx
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16:40 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/FuXhsQ
16:40 RacketCommitBot: racket/master fce4cba Robby Findler: loosen slightly the requirements for changing existing chars...
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20:51 RacketCommitBot: [racket] plt pushed 5 new commits to master: http://git.io/jcDeKg
20:51 RacketCommitBot: racket/master 6349f85 Robby Findler: 2d cond reader (not yet done)
20:51 RacketCommitBot: racket/master 7df363c Robby Findler: progress on 2d
20:51 RacketCommitBot: racket/master ded6cb1 Robby Findler: more test cases ...
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21:16 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/oZJ_hQ
21:16 RacketCommitBot: racket/master 24561e2 Neil Toronto: Finished matrix documentation, attendant fixes; please merge to 5.3.2...
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21:43 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/1D7bEA
21:43 RacketCommitBot: racket/master 22d1619 Robby Findler: Oops, sorry....
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