t to a List type checks all the elements of the list.
> There's no way to tell if every element of list is a string in less
> than O(N) time -- that information just isn't available anywhere.
>
> Sam
>
> On Thu, Feb 28, 2019 at 3:52 PM Brian Craft > w
son -- there's no way around it.
>
> Sam
>
> On Thu, Feb 28, 2019 at 2:04 PM Brian Craft > wrote:
> >
> > I would think there'd be a large performance issue, as well, due to
> needing an O(N) walk of the data. I'm having type checker issues with
>
ance that isn't yet in the docs. Are there any other resources on
performance?
On Friday, February 22, 2019 at 10:36:23 AM UTC-8, johnbclements wrote:
>
>
> It would be interesting to see how much faster (if at all) it is to run
> the TR version of this code.
>
> John
>
gt;>
>> - A list
>> - A hash with symbol keys
>> - A number
>> - A string
>> - A boolean
>> - Null
>>
>> The (andmap string?) approach implicitly assumes you're giving it a list.
>> But it might be something else instead, so you
sing version 6.0? Was it automatically available
> to you somewhere, or did you install it?
>
> Sam
>
> On Mon, Feb 25, 2019 at 1:46 PM Brian Craft > wrote:
> >
> > yeah, maybe version. Has this changed since 6.0?
> >
> > On Monday, February 25, 201
s)
On Monday, February 25, 2019 at 3:22:12 PM UTC-8, Sam Tobin-Hochstadt wrote:
>
> I think (andmap string? ...) is probably the easiest way to check that.
>
> Sam
>
> On Mon, Feb 25, 2019, 6:20 PM Brian Craft > wrote:
>
>> In typed racket, parsing a string list gives
In typed racket, parsing a string list gives me a JSExpr, which is a union.
I need to pass it to functions that operate on string lists, but can't
figure out how to please the type checker. Maybe with occurrence typing?
But I don't know how to assert "this is a list of strings".
--
You receive
cket/base)
>
> (: fn (-> String Symbol))
> (define (fn str) 'foo)
> hardy:/tmp clements> racket foo
> hardy:/tmp clements>
>
> I can’t honestly guess what the problem is. Wrong version of racket?
>
> John
>
>
> > On Feb 25, 2019, at 10
Doing a cut & paste from the typed racket docs, I'm getting a compile
error. Input file:
#lang typed/racket
(require typed/racket/base)
(: fn (-> String Symbol))
(define (fn str) 'foo)
'fn' taken from this page:
https://docs.racket-lang.org/ts-guide/more.html#%28part._when-annotations~3f%29
I'm doing a few performance tests, just to get an idea of racket
performance. The following result surprised me a bit. Parsing 1M strings
from a json array, like
(define samples (time (read-json (open-input-file "test.json"
running with 'racket test.rkt'
Comparing to js, java, and clojure:
Was this a reference to a particular racket lib? And if so, which one?
https://twitter.com/ID_AA_Carmack/status/577878167542734848
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) to the big-bang
> expression, similar to what Matthias did in his example ]
>
> Also do you see the same behavior if you change the initial state to be
> 100?
>
> —Spencer
>
>
>
> On Mon, Oct 6, 2014 at 10:05 AM, Brian Craft
> wrote:
>
>> If I record
onto-an-empty-scene) ;; when the state
> changes, draw ...
> (stop-when state-is-300))) ;; when the UFO's y
> coordinate is 300, stop.
>
>
>
> The animated gif is here:
>
> http://www.ccs.neu.edu/home/matthias/Tmp/UFO/i-animated.gif
>
>
ng it on ubuntu.
On Sun, Oct 5, 2014 at 6:13 PM, Matthias Felleisen
wrote:
>
> Can you send the full program please? Thanks -- Matthias
>
>
>
> On Oct 5, 2014, at 8:52 PM, Brian Craft wrote:
>
> > Hello -- Newbie here. I'm going through "Realm of Racket"
Hello -- Newbie here. I'm going through "Realm of Racket". I'm seeing an
odd effect when using this to-draw handler in big-bang:
(define (draw-a-ufo-onto-an-empty-scene game)
(let ([pos (game-pos game)])
(place-image IMAGE-of-UFO (round (vec-x pos)) (round (vec-y pos))
(empt
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