Hello,
I'm looking for a way to use Raket's structs in a functional way.
Example:
(define-struct person (name age))
(define p (make-person Nikita 25))
;; in documentation I found only setters, that mutate struct:
(person-set-age! p 26)
;; to make functional update I have to write
(define p1
On 20.10.10 09:16, Nikita B. Zuev wrote:
Hello,
I'm looking for a way to use Raket's structs in a functional way.
Have you tried struct-copy ?
--
regards,
Jakub Piotr Cłapa
_
For list-related administrative tasks:
On Oct 20, 2010, at 3:16 AM, Nikita B. Zuev wrote:
I'm looking for a way to use Raket's structs in a functional way.
Example:
(define-struct person (name age))
...
(define (person-age-set p proc)
(make-person (person-name p)
(proc (person-age p
Matthias has been
I will push this change shortly.
Jay
On Tue, Oct 19, 2010 at 7:19 PM, Nadeem Abdul Hamid nad...@acm.org wrote:
On Sat, Oct 9, 2010 at 6:12 PM, Jay McCarthy jay.mccar...@gmail.com wrote:
The next release has support for almost all the form elements:
Hi all,
I find the default emacs-style keybindings difficult to cope with in
Windows. Specifically, I'm used to Alt filling in for Meta in
emacs.
I've been a good sport in trying to get used to this new editing
environment. but reaching up to ESC and pressing 'w' is too awkward
for something
On 10/20/2010 09:05 AM, Stephen Bloch wrote:
On Oct 20, 2010, at 3:16 AM, Nikita B. Zuev wrote:
I'm looking for a way to use Raket's structs in a functional way.
Example:
(define-struct person (name age))
...
(define (person-age-set p proc)
(make-person (person-name p)
Yesterday, Adam Shaw wrote:
Hi --
Could someone tell me how to read in a data file in Int. Student or Adv.
Student?
I'd like something like
(define dict (read /path/to/dict))
and bind dict to a list of strings.
This works:
(with-input-from-file /path/to/dict read)
but you're
It's not in the student languages, and I'm not sure I like the name
from a teaching perspective (copy is too much of an implementation
issue).
On Wed, Oct 20, 2010 at 12:58 PM, Everett Morse we...@unoc.net wrote:
On 10/20/2010 09:05 AM, Stephen Bloch wrote:
On Oct 20, 2010, at 3:16 AM, Nikita
On Wed, Oct 20, 2010 at 12:11 PM, Joe Snikeris j...@snikeris.com wrote:
I find the default emacs-style keybindings difficult to cope with in
Windows.
Somewhat related:
I'm editing a file and press C-s to search for something. I press C-o
to switch to the search frame. I enter my search text.
I turn off menu key bindings:
Edit | Preferences... | Editing | General | Enable keybindings in menus
(turn it off). Now you have Alt at your disposal, and with it a good
chunk of Emacs keybindings.
I edit all my code in DrRacket on Windows, and with this
configuration, it works very well.
On Wed, Oct 20, 2010 at 1:54 PM, Shriram Krishnamurthi s...@cs.brown.edu
wrote:
I turn off menu key bindings:
Me too.
(turn it off). Now you have Alt at your disposal, and with it a good
chunk of Emacs keybindings.
What do you press to copy selected text?
I edit all my code in DrRacket
I turn off menu key bindings:
Me too.
So what's the problem w/ using Alt?
(turn it off). Now you have Alt at your disposal, and with it a good
chunk of Emacs keybindings.
What do you press to copy selected text?
C-Space to start selecting, M-w (Alt+w) to copy, and C-y to paste.
It is
On Wed, Oct 20, 2010 at 2:04 PM, Shriram Krishnamurthi s...@cs.brown.edu
wrote:
(turn it off). Now you have Alt at your disposal, and with it a good
chunk of Emacs keybindings.
What do you press to copy selected text?
C-Space to start selecting, M-w (Alt+w) to copy, and C-y to paste.
Ahh
That's good! Danny and I have been using update-person-age for this.
On Wed, Oct 20, 2010 at 2:21 PM, Tony Garnock-Jones to...@ccs.neu.edu wrote:
Stephen Bloch wrote:
person-age-set
set-person-age (without the !)
person-with-age
I like this last one, especially if it were possible to use
Tony Garnock-Jones wrote at 10/20/2010 02:21 PM:
Stephen Bloch wrote:
person-age-set
set-person-age (without the !)
person-with-age
I like this last one, especially if it were possible to use the old
abbreviation of / for -with-:
(person/age p 25)
I've used things like person-with-age
I have a prototype that supports syntax like this one:
(dot a-world ufo wings left)
which would select the left field of a wings field in a ufo field of a world
struct.
Similarly,
(set a-world ufo wings left 'broken)
would be a functional update.
I intend to add it into the 2htdp
Neil Van Dyke wrote:
The only reason I'm not 100% thrilled by abbreviating it as person/age
is that that identifier is just a punctuation character rotated 45
degrees away from the getter, person-age.
That (quasisymmetry) was one of the things I liked about it :-)
(person-age p)
Tony Garnock-Jones wrote at 10/20/2010 02:35 PM:
Neil Van Dyke wrote:
The only reason I'm not 100% thrilled by abbreviating it as
person/age is that that identifier is just a punctuation character
rotated 45 degrees away from the getter, person-age.
That (quasisymmetry) was one of the things
Are you all also considering some way to conveniently update more than one
at a time? Functional style is still much more cumbersome than mutation
style.
(set (set a-world ufo wings right 'damaged) ufo wings left 'broken)
starts to get cumbersome quickly.
Is something like the below possible?
Should be doable:
(set a-world ufo wings [right 'damaged] [left 'broken])
is the most likely syntax I anticipate.
On Oct 20, 2010, at 2:50 PM, engin...@alum.mit.edu wrote:
Are you all also considering some way to conveniently update more than one
at a time? Functional style is still
On Wed, Oct 20, 2010 at 4:50 PM, engin...@alum.mit.edu wrote:
Are you all also considering some way to conveniently update more than one
at a time? Functional style is still much more cumbersome than mutation
style.
(set (set a-world ufo wings right 'damaged) ufo wings left 'broken)
starts
Hi all,
i'm reading the documentation on cookies (net/cookie), and i try to save
with a cookie an user action in my blog.
For example, the cookie my-cookie has this content :
id=blabla; Version=1
OR this one : id=bla bla; Version=1
How can i just extract the string bla bla or blabla ?
thanks,
Hi,
My recollection is that the current graphics toolkit has limited
support for transparency, but it should work for drawing text on an
image. Can you send a small example illustrating the problem?
Cheers,
N.
On Mon, Oct 18, 2010 at 2:07 PM, Christophe Vandenberghe
chv...@gmail.com wrote:
I
Look up this library:
web-server/http/cookie-parse
It has the functions to do what you want.
N.
On Wed, Oct 20, 2010 at 9:31 PM, scouic sco...@gmail.com wrote:
Hi all,
i'm reading the documentation on cookies (net/cookie), and i try to save
with a cookie an user action in my blog.
For
Looks fun.
On Mon, Oct 18, 2010 at 8:56 PM, John Clements
cleme...@brinckerhoff.org wrote:
The challenge is how to deal with generating sounds: do you use vectors,
explicit for, or HOF? If the latter, do you use lambda or local?
IIUC, HOFs are the simplest way to do this. You want a function
Hey noel, thank you, it works perfectly.
However, i have the following problem : i can't modify my cookie-value ...
my blog starts with
(define start request)
( my-home-page request))
next,
(define (my-home-page request)
(define foo (make-cookie id my-content)
(set! foo (set-cookie id
On June 18th, Raffael Cavallaro wrote:
On Jun 18, 2010, at 1:41 PM, John Clements wrote:
I think it's a good idea to be aware that the ability to compile
and run arbitrary programs on the computers sold to us by Apple
(or any other company) is not a constitutionally protected right,
On Wed, Oct 20, 2010 at 10:03 PM, scouic sco...@gmail.com wrote:
I don't understand : i start my blog wich calls (my-home-page), and this one
creates a cookie. But in (a-post request) i can't i modify my cookie,
because foo is an unknown word ...
How can i retrieve the content of my cookie in
Yes! That's what I need more. Thanks for the quick response.
- Adam
On Oct 19, 2010, at 4:14 PM, Matthias Felleisen wrote:
Is 2htdp/batch-io as documented something you might find useful?
On Oct 19, 2010, at 3:58 PM, Adam Shaw wrote:
Hi --
Could someone tell me how to read in a
Also try:
http://www.codaset.com/pmatos/eboc/source/master/blob/eventb-parser.rkt
It's a parser for the formal language Event-B.
Cheers,
PMatos
Eduardo Bellani ebell...@gmail.com
writes:
I've just completed a small example for a logo like language using the
parser tools. Take a look at
Yes. This is something I think would be an interesting research
project, along with a generalisation of weak refs. It's fairly simple
to frame as a reinforcement learning problem. This is some work on
this, but I think tech. has moved on in important ways since.
N.
On Sun, Oct 17, 2010 at 12:04
I'm trying to compare two paths for equality; I misread normalize-path
and didn't realize that it does not do case folding, so that on
Windows,
(equal? (build-path C:\\)
(build-path c:\\))
returns false. What's the right way to compare paths for equality?
As a related
Four minutes ago, Danny Yoo wrote:
I'm trying to compare two paths for equality; I misread
normalize-path and didn't realize that it does not do case folding,
so that on Windows,
(equal? (build-path C:\\)
(build-path c:\\))
returns false. What's the right way to compare
I'm trying to compare two paths for equality; I misread
normalize-path and didn't realize that it does not do case folding,
so that on Windows,
(equal? (build-path C:\\)
(build-path c:\\))
returns false. What's the right way to compare paths for equality?
IIRC, there
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On 10/20/2010 08:38 PM, Danny Yoo wrote:
Yikes. Ok, is there a way to tell if a filesystem root is
case-sensitive or not?
Use a POSIX compatible operating system. Bam, your filesystem root is
case-sensitive.
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Version:
On Wed, Oct 20, 2010 at 10:54 AM, Shriram Krishnamurthi s...@cs.brown.edu
wrote:
I turn off menu key bindings:
Edit | Preferences... | Editing | General | Enable keybindings in menus
Aha! I think I used to know that ...
... while we're on the subject, I see that M-( does in DrRacket what
it
Thank you all for your replies. I somehow missed `struct-copy', this
is exactly what I wanted. Bad thing I can't pass lambda to it like:
(struct-copy person
myperson
(age (lambda (age) (+ age 1
p.s.
About names `person/age' vs `person-with-age', maybe `person-age'
On Wed, Oct 20, 2010 at 8:38 PM, Danny Yoo d...@cs.wpi.edu wrote:
IIRC, there was no right way -- I think that on windows you can have
some drives be case-sensitive and some are not.
Yikes. Ok, is there a way to tell if a filesystem root is
case-sensitive or not?
I am not aware of
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