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11:42 RacketCommitBot: [racket] plt pushed 2 new commits to master: http://git.io/UcS4ew
11:42 RacketCommitBot: [racket/master] shifted eval code, probably not needed - Matthias Felleisen
11:42 RacketCommitBot: [racket/master] added some more format examples; Closes PR 9879 - Matthias Felleisen
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11:56 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/ojU17A
11:56 RacketCommitBot: [racket/master] provide the color structs using (provide (struct-out ...)) - Robby Findler
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13:23 yoklov: well, i have fallen in love with match.
13:23 yoklov: it makes my code so much cleaner.
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13:31 adu: yoklov: :)
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13:35 yoklov: it made short work of some truly horrifying nested conditionals.
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13:45 asumu: Yep, match is great. Match expanders make it even better.
13:50 yoklov: haha, to be honest i've only been doing list, list*, and (? pred? pat …).  match expanders allow you do define new ways of matching things?
13:51 asumu: Yep
13:51 asumu: e.g., I wrote one for objects
13:51 yoklov: oh
13:51 yoklov: that definitely sounds useful
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14:03 stamourv: yoklov: Another cool match feature:
14:03 stamourv: rudybot: (match '(1 2 3) [`(,a ,b ,c) (+ a b c)])
14:03 rudybot: stamourv: your sandbox is ready
14:03 rudybot: stamourv: ; Value: 6
14:03 stamourv: I prefer quasiquote and unquote to `list' patterns.
14:04 yoklov: i think that it can be hard to read
14:04 stamourv: rudybot: (match '(1 2 3) [`(a ,b ,c) (+ a b c)] [_ (error "head not 'a")])
14:04 rudybot: stamourv: error: head not 'a
14:04 yoklov: and when i'm unquoting all of them
14:04 yoklov: i feel like i might as well just use list
14:05 yoklov: (or list*)
14:05 asumu: Yeah, it can be a bit line-noisy, but I like the symmetry when the pattern and the result are both lists.
14:05 yoklov: hm.
14:05 yoklov: that is the case for me.
14:05 asumu: rudybot: (match '(1 2 3) [`(1 ,b ,c) `(2 ,b ,c)])
14:05 rudybot: asumu: your sandbox is ready
14:05 rudybot: asumu: ; Value: (2 2 3)
14:05 stamourv: But hey, `match' lets us have both. :D
14:06 stamourv: Extensible pattern matching is awesome.
14:06 yoklov: definitely :)
14:06 stamourv: Haskell/ML pattern matching feels crippled in comparison.
14:06 stamourv: s/feels/is/ :P
14:07 asumu: Though one thing that I find awkward is matching multiple things.
14:08 asumu: e.g. in Haskell you can do f x:xs y:ys = ...
14:08 stamourv: rudybot: doc match*
14:08 rudybot: stamourv: http://docs.racket-lang.org/reference/match.html#(form._((lib._racket%2Fmatch..rkt)._match*))
14:08 stamourv: asumu: ^
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14:10 asumu: Oh. I have wanted that for a while and there it was.
14:10 asumu: Just under my nose (or whatever the idiom is)
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18:40 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/Hs83xQ
18:40 RacketCommitBot: [racket/master] document the fact that resolve-planet-path is exported from - Robby Findler
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19:44 RacketCommitBot: [racket] plt pushed 1 new commit to master: http://git.io/3jMsng
19:44 RacketCommitBot: [racket/master] fixed promise/c so it creates chaperone contracts when its - Robby Findler
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19:58 yoklov: so, I'm working on a toy lisp, and I'm wondering if I can implement let* as (let* ((var val) …) . body) => (lambda () (define var val) … . body)
19:58 yoklov: or rather ((lambda () …))
20:01 jonrafkind: if the define's are mutually inclusive then i guess its ok
20:02 jonrafkind: oh wait nevermind, thats letrec
20:02 yoklov: oh, so it's not okay?
20:02 jonrafkind: it should work the way you do it
20:03 jonrafkind: i haven't used let/let*/letrec in so long..
20:03 yoklov: cool, it seemed silly to create a new env. frame each time
20:03 jonrafkind: bygones of a past era!
20:03 yoklov: err, you haven't/
20:03 yoklov: *?
20:03 jonrafkind: no i just use define
20:04 jonrafkind: occasionally I use `let' to create a definition context, but thats about it. i do (let () (define x ...) (define y ...) ...)
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20:04 yoklov: i guess that keeps the nesting down
20:05 yoklov: i guess because it seems less idiomatic
20:06 jonrafkind: whats less idiomatic, using define instead of let?
20:06 yoklov: yeah, at least if you're doing it most of the time
20:07 jonrafkind: well thats why I claim let is a bygone of a past era. the new idiomatic way is define
20:07 yoklov: though, if it means you don't have to sometimes use letrec
20:07 yoklov: err, is it?
20:07 jonrafkind: i mean let is just a cute way to get "normal" programming if all you have is lambda
20:08 jonrafkind: but if you aren't shackled to lambda as your only form that can bind variables then you can use different forms
20:09 yoklov: hasn't scheme always had lexically scoped define though?
20:10 yoklov: so its not like they were ever really that shackled by lambda
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20:15 jonrafkind: well thats true, i suppose the difference is being able to mix define's with expressions
20:15 jonrafkind: although i dont remember the exact semantics of define in r5rs
20:20 yoklov: racket still complains if i use a define in an expression context though
20:20 yoklov: at least, it sometimes does.
20:20 yoklov: (begin (define x 5) x) seems to work, but i know it's complained about this recently to me.
20:27 jonrafkind: i mean you can do (let () (+ 1 2) (define x 5) (+ x 12))
20:27 jonrafkind: begin doesnt create a definition context
20:27 yoklov: yeah
20:29 yoklov: but there are some places you can't have defines, right? or does http://docs.racket-lang.org/reference/__expression.html never actually go anywhere
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