Part of the problem is that you are running your program within a module.
Unless a variable x is explicitly designated as assignable via (set! x ...),
the execution of a module makes the variable immutable. You can see how it
all gets expanded with the macro stepper (disable hiding):
(module
Hello, Racket users!
Here is an example I difficultly understand:
#lang scheme
(define saved '*dummy-value*)
(define next-year (+ 1 (call/cc (lambda (g) (set! saved g) 1997
(saved 2012)
In some other interpreters, it is OK. But Racket's answer is:
define-values: cannot re-define a
On Jan 6, 2013, at 10:38 AM, Sam Tobin-Hochstadt wrote:
> Is the use of index types a fundamental refactoring, or something that
> could be added to Hari's code?
>
> I ask because having 3+ different functional random-access data
> structures seems like a loss for Racket code interoperability o
Great! That'll do.
Thank you very much!
-- Erich
On Sun, 6 Jan 2013 10:15:16 -0700
Matthew Flatt wrote:
> For modifier keys, at least, you can use `get-current-mouse-state'
> (added in 5.3.1.x).
>
> > Is there a cross-platform way to detect a keyboard press without
> > opening any frame?
___
For modifier keys, at least, you can use `get-current-mouse-state'
(added in 5.3.1.x).
At Sun, 6 Jan 2013 17:11:52 +, Erich Rast wrote:
> Hi everybody,
>
> Is there a cross-platform way to detect a keyboard press, including
> command keys, without opening any frame? Something like get-key-pre
Hi everybody,
Is there a cross-platform way to detect a keyboard press, including
command keys, without opening any frame? Something like get-key-press
from the graphics legacy library but without viewport?
I'd need this for detecting a key combination before the application's
main frame opens in
Yesterday, Michael Wilber wrote:
>
> JSON doesn't specify a way of encoding dates. See http://json.org/
> You have to convert your date to a string first, like this:
IIRC, there were two common ways to encode dates -- if one of them
becomes (or have become) more popular, then maybe it'll make sen
On Sat, Jan 5, 2013 at 7:31 PM, Neil Toronto wrote:
> Thanks for the pointers!
>
> I can't use David Van Horn's because it's untyped, and I need to use this in
> Typed Racket.
Well, you might consider porting his code to Typed Racket. I hear it
was designed for that. ;)
> Last time I checked Ha
On 01/05, Michael Wilber wrote:
> JSON doesn't specify a way of encoding dates. See http://json.org/
> You have to convert your date to a string first, like this:
>
> racket> (jsexpr->string (date->string (current-date)))
> "\"Sat Jan 05 11:20:35-0700 2013\""
I'm checked both (racket/date)'s da
9 matches
Mail list logo
