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<readyready15728>
Just learning Racket ... why is the lambda written like this in the Racket Guide? (filter (lambda (i) (i . < . 3)) '(1 2 3))
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<erkin>
What do you mean?
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<readyready15728>
erkin, (i . < . 3) is not syntax I've seen in any other Lisp
<readyready15728>
I've only ever seen things like (< i 3) until now
<erkin>
Oh yeah, that's a Racketism. I don't like it myself but it's meant to allow infix operations, probably to make Racket more palatable to people used to Algol syntax.
<erkin>
Essentially, if you put two dots around an element in a list, it puts that element in the head of the list at reader time.
<erkin>
So '(1 2 . 3 . 4 5) becomes '(3 1 2 4 5)
<erkin>
Similarly, (2 . + . 4) becomes (+ 2 4).
<readyready15728>
That's what I thought ... thanks
<readyready15728>
And yes it's ugly
<erkin>
I've never used it myself. I think it's conversely confusing for newcomers because they might associate it with the cons dot.
<readyready15728>
Yeah I don't know what they were thinking
<erkin>
It could look better as (2 .+. 4), à la Haskell's backticks, but . is allowed in identifiers by default.
<readyready15728>
Oh no, Haskell *shudders*
<erkin>
Haha
<bremner>
erkin: yeah, but do we really need the cons dot? or is it one of those historical artifacts like the names car and cdr
<erkin>
I agree but I can't think of a better way to represent an improper list.
<erkin>
Well, not 'better' but any other.
<bremner>
rudybot: eval (cons 1 2)
<rudybot>
bremner: ; Value: '(1 . 2)
<rudybot>
bremner: your sandbox is ready
<erkin>
That's unquoted.
<bremner>
ah. right. well, we have quasiquote.
<bremner>
not sure I'm winning for complexity though ;)
<erkin>
Haha
<erkin>
I think (foo . bar) should've been self-quoting, just like #(foo bar).
<erkin>
But I guess it's a matter of consistency with the reader. If it begins with an lparen, it *must* be #%app.
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<erkin>
The vector syntax is a separate thing.
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<erkin>
Probably the same reason () isn't self-quoting.
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<readyready15728>
What's the best way to work with raster images in Racket?
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<erkin>
Within DrRacket REPL
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<bremner>
emacs racket-mode also works
<bremner>
as does geiser, iirc.
<bremner>
but maybe you mean a library?
<rsaarelm>
Do people generally use the standard library OO system in Racket or avoid OO or roll their own? I'm new to the language and was wondering if there's maybe a similar situation as with OCaml where the language has an OO system but it's sort of fallen to the wayside and not used in practice.
<rsaarelm>
Also, are there any recommended resources for learning it for experienced programmers other than just the guide and the reference from the standard docs? Something similar to this thing for Haskell would be great http://dev.stephendiehl.com/hask/
<bremner>
IIUC, the OO system is mainly used for GUI stuff
<rsaarelm>
That's somewhat helpful. I'm planning on doing some video game object modeling that's going to push the expressivity, and "mostly for GUI" sort of points towards the mainstream 90s sort of OO that ended up being a bit too rigid for complex videogame objects.
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<rsaarelm>
I never really looked into it but people talked about it as something really impressive back when.
<erkin>
Disclaimer: I've only toyed around with Swindle. I never needed to use anything other than racket/class because I haven't actually used any OO outside GUI programs.
<rsaarelm>
I probably want to read Art of the Metaobject Protocol sometimes too.
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<rsaarelm>
Trying to figure define/generic out. Guide doesn't seem to have much on it, Reference has stuff but it's a bit terse of course.
<rsaarelm>
This sort of looks like Rust's traits?
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<samth>
rsaarelm: it's a little like that
<samth>
it's also like OO in that you define the "generic" and then you make various structs be instances by implementing the appropriate methods
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<rsaarelm>
Also looks like there's a multimethod package.
<rsaarelm>
Another trickiness with game logic is that rules might vary based on properties of multiple participants.
<rsaarelm>
Like, game's about verbs as well as objects, and verbs can be like [character] uses [tool] on [object], that vary based on all three participant objects.
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