#racket on 2022-03-09 — irc logs at libera.irclog.whitequark.org

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00:36 <klf> (define (foo x y)

00:36 <klf> (define x 5) x)

00:36 <klf> (display x)

00:36 <klf> Why does it say x is undefined?

00:36 <klf> (foo "hello" 10)

00:38 <klf> rudybot: (define (foo x y)

00:38 <klf> <klf> (display x))

00:38 <rudybot> klf: I've just been surprised I can't do something like, `(define (foo x y) "Takes an X and a Y, does the thing with them")`

00:38 <klf> rudybot: (define (foo x y) (display x))

00:38 <rudybot> klf: Done.

00:39 <klf> rudybot: eval (foo "hello" 10)

00:39 <rudybot> klf: ; stdout: "hello"

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00:51 <klf> oddly enough, that same code works in scheme.

00:51 <bremner> inner defines need to be at the top of the function

00:52 <bremner> or start a begin block e.g.

00:53 <bremner> I think it's maybe a bug that that isn't caught before runtime

00:53 <bremner> but that's just like, my opinion, man

00:55 <klf> https://inst.eecs.berkeley.edu/~cs61a/fa14/assets/interpreter/scheme.html

00:56 <klf> bremner, maybe, because if you copy-and-paste into that interpreter, it didn't complain

01:01 <klf> s/didn't/doesn't/

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01:11 <klf> what's the other bot besides rudybot?

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15:45 <scubagear[m]> Is it true that the convention of ending a procedure name with an exclamation indicates that the procedure modifies one of its arguments? Would you also do the same if the result of a procedure is instead a lambda that modifies one of its arguments?

15:46 <scubagear[m]> * of its own (the lambda's) arguments?

15:50 <tonyg> scubagear[m]: yeah I think that's generally true. Macros, too (e.g. `set!`). But it definitely gets hazy when the mutation is one step removed

15:52 <tonyg> scubagear[m]: then maybe I'd consider something like `do-something!-maker`, or `make-do-something!`, but the `!` there is logically kind of quoted and not part of the name of the factory, if you see what I mean. Like ideally it'd be called `make-"do-something!"` but you can't quote like that :-)

15:54 <scubagear[m]> tonyg: yeah I see what you mean

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