#racket on 2020-12-17 — irc logs at freenode.irclog.whitequark.org

2020-09-10 10:23 samth changed the topic of #racket to: Racket v7.8 has been released: https://blog.racket-lang.org/2020/08/racket-v7-8.html -- Racket -- https://racket-lang.org -- https://pkgs.racket-lang.org -- Paste at http://pasterack.org

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08:22 <jjk96> I'm trying to understand how the immutable hash-update implementation can be (near) constant time, so I'm looking at the source code https://github.com/racket/racket/blob/09c6ba48f67e4e3ebe7f334b2e15de5bc2260c81/racket/collects/racket/private/more-scheme.rkt#L343 but I don't understand how/why it uses the `set` function on line 356.

08:22 <rudybot> https://teensy.info/tV5CpqbSc0

08:22 <jjk96> I would expect that it would return a new hash-table, not a set

08:23 <jjk96> Oh, I see, it's using `hash-set` actually, now let's have a look at that implementation

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12:34 <bremner> I'm looking for a way to "force" an existing module to provide one binding. include doesn't do it because it's a module. Any ideas?

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13:48 <yurb> bremner: I once saw there is https://docs.racket-lang.org/rackunit/api.html#%28form._%28%28lib._rackunit%2Fmain..rkt%29._require%2Fexpose%29%29

13:48 <rudybot> https://teensy.info/NF4XjzxuIe

13:48 <yurb> But haven't used it

13:48 <bremner> yurb: thanks, I'll give it a shot

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16:12 <samth> bremner: what do you mean by "force"?

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16:33 <bremner> samth: I think I mean exactly what "require/expose" does, at least according to my one test

16:34 <bremner> I have a bunch of student code, and I want to run some tests, but I neglected to have them provide the function in question

16:36 <samth> ah yes, that seems like a good use of require/expose

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