All I know is what I read here:
http://googleresearch.blogspot.com/2009/08/under-hood-of-app-inventor-for-android.html
shriram
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> [...] and a scripting language for the App Engine.
That would be news to me!
Shriram
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Is it running Racket underneath?
On Thu, Jun 24, 2010 at 2:20 PM, Jose A. Ortega Ruiz wrote:
> On Thu, Jun 24 2010, Insik Cho wrote:
>
>> I see.
>>
>> Do you think if emacs is a good tool for editing, saving and executing
>> racket programming?
>>
>> I prefer command-like environment to GUI. But,
I find DrRacket very hard to use on older machines and netbooks.
I recently upgraded to an Acer Aspire 1810T. This is about $600 and
has a netbook form factor (same chassis as the 1410T, which is their
netbook). The 1366x768 screen makes the keyboard nice and wide and
great for use in travel. W
Surely someone here has done something like this before, and I'd like
advice on how to do it.
We're in the process of converting Margrave, our security analysis
tool, over to Racket, and to exploit DrRacket as its user environment.
What we'd like to be able to do is this: in DrRacket,
Interact
Paul,
You can already run WeScheme on your Android:
http://www.wescheme.org/
Due to a complete rewrite this summer, WeScheme and Racket will come
ever closer together.
But I may be misunderstanding what you mean by "client".
Shriram
_
For lis
"easy" is great. I assume I should ignore the comment that says
; XXX This is almost certainly wrong.
Shriram
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> The only thing needed beyond creating the tarball is an
> info.rkt file.
You underestimate the Scheme "community"'s ability to divide. The
controversy will shift entirely to what is acceptable in info.rkt
files. Soon you will end up with the Revised^n Reports on the Racket
Information File For
> But I doubt raco could understand a .plt file that was
> un-base64-encoded to just be a .tar.gz.
There are language implementations that can import directly from zip
files... JARs *use* zip, but Python can load directly *from* zip.
Shriram
_
Fo
I'm told Gambit does, too.
On Sat, Jul 3, 2010 at 8:19 AM, Shriram Krishnamurthi wrote:
>> But I doubt raco could understand a .plt file that was
>> un-base64-encoded to just be a .tar.gz.
>
> There are language implementations that can import directly from zip
> fil
http://docs.racket-lang.org/guide/hash-reader.html
> #reader"five.rkt"abcde
"abcde"
Why is the string "abcde" not in a list?
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I don't quite know where to read to understand, and to work around,
the following scoping rules.
Here's a very simple module (details not important, only the functions
being define-for-syntax'd):
(module my-new-syntax racket
(provide (except-out (all-from-out racket) lambda)
(
Would it help you to have a Battleships in Universe as an example?
On Jul 25, 2010 3:27 PM, "Todd O'Bryan" wrote:
> In the three-week intro course I'm teaching, the students have
> expressed a desire to program Pong played over the network, so that
> they can play against each other when they get
Todd,
Danny has defined updaters for his world. However, the reason we
didn't make these public is because we ultimately need to deal with
lvalues, which (a) are arguably not a good idea, and (b) we certainly
can't do as a macro anyway. Make sure you think about that.
Shriram
__
posn number -> posn
>
> Completely non-mutational--just recreates the exact same structure,
> except for the updated value.
>
> Which lvalues am I missing?
>
> Todd
>
> On Sun, Jul 25, 2010 at 6:44 PM, Shriram Krishnamurthi
> wrote:
>> Todd,
>>
>
If you're satisfied with that, then simple updaters will do the trick,
and you'll be fine. But in practice you tend to have complex nested
structures, and this form of updaters turns out to be rather less
useful.
Shriram
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Here's the file "sig":
#lang racket
(define-signature Foo (make-foo foo?))
Here's another file:
#lang racket/unit
(require "sig")
(import)
(export Foo)
(define-struct foo ())
When I execute this, I get
define-unit: unknown signature in: Foo
I would have thought that the the si
Funnily enough, I asked Matthew a similar question earlier this
evening. Without permission, I quote his reply:
>> When do two module designators designate the same module?
> Do you mean "the same for any installation" or "the same for the
> current installation"?
>
> For the former: normalize e
Neil's superb CSV reader seems to unfortunately conflict with the
notion of CSV on the OS that maybe loves CSV the most: Windows. I
spent a while tracking down a CSV reader failure, and was able to
isolate it to the program below:
#lang racket
(require (planet neil/csv:1:6/csv))
((make-csv-reader
The Scribble Book format
https://docs.racket-lang.org/scribble/Book_Format.html?q=scribble%20book
has the *chapter* as the highest-level unit. For a book with lots of
chapters, it's useful to have a higher-level unit, like a *part*. (E.g., *How
to Design Programs* is broken down by parts, and t
Stephen Bloch mentioned his book Picturing Programs. I am happy to
recommend it, too, so you don't think only its author likes it:
http://picturingprograms.com/download/
It has many similarities to, but also some real differences from, both
HtDP and HtDP 2/e. At a *very* coarse level,
HtDP: nu
I am having some trouble figuring out how to use syntax-parse in
combination with wanting literals (aka, internal keywords) in a macro
definition. I have
(syntax-case stx (:)
and am trying to achieve a similar effect. I tried
(syntax-parse stx #:literals(:)
but that resulted in
syntax-
That fixed the problem, thanks.
I was disappointed by some of the resulting error messages, though.
I'm bringing these up here because I don't know whether these error
messages are an artifact of the strategy Jay suggested.
To simplify, suppose I have
(define-syntax (defvar: stx)
(syntax-parse
parse-define-struct will parse an expression with anything in the
"define-struct" position; e.g.,
(let ([s #'(anything-goes m (a b))])
(parse-define-struct s s))
succeeds. However, it is strict about what goes in the field
positions, e.g., it cannot be used to parse
(let ([s #'(anything-goe
I guess to me, the term "literal identifier" is an oxymoron. It's
either a literal (5, #f, in this case :) or an identifier (foo, car,
+). Unless "identifier" means nothing more or less than "symbol".
When I write (:) in syntax-case, I'm saying ": is not a binding form;
I want to see literally a
build-struct-generation is a really useful utility, but I don't
understand how to use it. Specifically, see
Welcome to DrRacket, version 5.1.3 [3m].
Language: racket; memory limit: 128 MB.
> (require syntax/struct)
> (build-struct-generation #'p (list #'x #'y) #f #f)
'(let-values (((struct: make-
That fix worked -- thanks!
Yep, it did have a "mzscheme" whiff about it.
It would be good for b-s-g to cross-reference d-s/d (I see a
define-struct/derived, not struct/derived) -- I wouldn't have found it
from the docs alone.
However, I am a little unclear on the value of d-s/d. Is it solely to
I have a define form that expands into two two definitions. Usually I can write
(my-define ...) ==> (begin (define ...) (define ...))
However, this doesn't interact well with local. Is there a way of
identifying that I'm in a local context and expanding into something
else so that this "just wo
I hadn't realized I was getting the wrong local. Your suggestion did
the trick and the result made my library far better than I'd hoped.
Shriram
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Is there a way of checking whether a value position is undefined?
Specifically, I'm trying to recognize the undefined value put in
structures by SHARED. It appears that a undefined value is sometimes
EQ? to another one, but this doesn't seem to be specified in the
documentation (ie, that there is
The docs for build-struct-names says
The result is a list of identifiers:
* struct:name-id
* ctr-name, or make-name-id if ctr-name is #f
* name-id?
* name-id-field, for each field in field-ids.
* set-name-id-field! (getter and setter names alternate).
*
I presume this last line () is jus
In a syntax-case, I can obtain the term being processed: eg,
(define-syntax (foo stx)
(syntax-case stx ()
[... (with-syntax ([term stx]) ... #'term)]))
In syntax-id-rules, the RHS is like a syntax-*rules*, so I don't know
of a way of obtaining access to the source. This would be
particularl
> Is there a reason not to just use `syntax-case' (or even better,
> `syntax-parse')?
Sheer ignorance, my dear chap. I didn't realize that that worked!
(A docs hint may be in order)
For those reading this later, here's an example:
(define-syntax (String$ stx)
(syntax-case stx (String$)
On Sat, Sep 3, 2011 at 11:17 PM, Shriram Krishnamurthi
wrote:
> Is there a way of checking whether a value position is undefined?
> Specifically, I'm trying to recognize the undefined value put in
> structures by SHARED. It appears that a undefined value is sometimes
> EQ? to
This program
#lang racket
(require mzlib/pconvert)
(parameterize ([show-sharing false])
(print-convert
(shared ([-a- (list 0 -b-)]
[-b- (list 1 -a-)])
-a-)))
produces this output in 5.1.3:
Language: racket; memory limit: 128 MB.
'(shared ((-0- `(0 (1 ,-0- -0-)
How do I
Just in case my example is misleading, I want to suppress ALL shared
printing if possible.
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11 at 10:09 PM, Sam Tobin-Hochstadt wrote:
> What would be printed for cycles?
>
> On Mon, Sep 5, 2011 at 9:56 PM, Shriram Krishnamurthi
> wrote:
>> Just in case my example is misleading, I want to suppress ALL shared
>> printing if possible.
>> ___
I suspect everyone who teaches has run into just such a desire. But
there's a "when" problem.
We WANT students to be able to write checks before they write the
function. That means their file can look like
(check-expect (f 10) ...)
(define (f x) ...)
But if check-expect's just ran like regular
I thought I saw that (ie, C-x o not working) a few times, but to be
sure I tested just now in a fresh DrRacket 5.1.3, and C-x o works for
me (phew!).
Shriram
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Thanks for the very informative thread.
Piecing together what Asumu, Jay, Robby, and Eli said, I think I
understand what's going on, and I think this actually answers a
question I asked last year and didn't get an answer to: Why do require
and provide export their sub-forms as macros rather than j
In Windows 7:
Over the past four days I've been using DrRacket intensively. During
this time it has crash on me at least twice a day, each time exiting
with error code 3 (according to the Puttycyg shell).
I eventually noticed that Dexpot (a virtual window manager for
Windows), which has otherwis
This looks like a reasonable way to get an element, but thinking
ahead, you will probably want something both like "first" (which you
have) and a corresponding "rest".
The problem is that which element you get from the "first" operation
is nondetermistic in a set. Therefore, you have to either
-
I'm trying to convert some old slatex'ed documents into scribble and
running into trouble. I don't seem to have a clear enough handle on
how to use codeblock.
I can, for instance, convert
\begin{schemedisplay}
foo
bar
\end{schemedisplay}
into
@mycode{
foo
bar
}
where
@(defi
Thanks: that makes sense. But in that case, setting aside the
abstraction issue for a moment, could you explain why
@codeblock{
(define (f x) (x "three"))
}
works as expected -- it colors the sub-parts as the appropriate
syntactic categories, not all as string -- but
@code
Over the summer, we built a new tool for visualizing program
execution: think of it as a complement to the Stepper. It is similar
in that it shows you the steps of program execution, what they
evaluate to, and thus how the result is obtained (though it focuses
only at the level of user-defined fun
Robby --
I don't know enough about how the internal drawing routine of DrRacket
works, so you could help clarify that.
In 2htdp/universe, the act of "movement" is represented by
reconstructing the entire scene. Of course, there may be sharing:
(define bg ... something complex ...)
;; at time 1
Time isn't the only measure. And in terms of space, I don't think
you're accounting for all of it.
When you make universe scenes bigger, you tend to see GC pressure.
This *suggests* to me that there is not a lot of sharing from one
display to the next; rather, an entire WIDTHxHEIGHT bitmap is bei
Hi Charlie,
Yep, Catalan numbers!
Here's something that may help. Add the following two lines to the
top of your file --
#lang planet tracer/tracer
(trace-all)
-- and put a concrete call at the end, eg:
(num-distinct-trees 3)
Go to Language | Choose Language... and select the option at the
I understand. It would help if you could tell me what would have been
useful to drop from the output -- this feedback helps us a great deal.
There is *some* configurability:
- no trace command = just run the program
- (trace-all)
- (trace-failed-checks) = just the tests that failed
- (trace-e
Yep, that's what he's saying.
I know why you're confused. Let me see if I can help.
Here's an input program:
'(1 2 3)
Now be careful to make the following distinction:
- what it computes
- what it prints
What it computes is a list with three values. There are at least
three different ways
I used different words than Matthias because we were trying to offer
somewhat different explanations of what is happening. You chose to
use his words in response to mine, which only confuses things further.
(There is, incidentally, a good reason why (+ 1 2) could, but does
not, evaluate to (+ 1 2
You keep thinking (1 2 3) is the canonical form of a list. It is
not. It's just a particular *print representation* of list. So is
# or one of the many alternatives Eli proposed.
Your attempt to use an interpreter model is commendable but falls
short. That is because you only described the REA
It depends on what kinds of compilers/interpreters they were trying to
build. A course of study for Fortran would like quite different from
one for ML would look quite different from one for JavaScript (though
there are of course many overlaps).
Shriram
___
> It's just that I don't understand why you (i.e.
> Racket implementers) choose Racket by default prints list this
> way (different than all other lisps). I think this choice can confuse
> [...] users who switches from different lisp
> implementations [...]
Then it nicely accomplishes the task of
We are not teaching Lisp. We're teaching Racket.
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> Ok, maybe this is not something that's important in other programming
> languages, but it *is* important in lisps. As a lisp educator, how can you
> *not* to teach this fundamental fact about lisp?
It's funny that here you're berating Robby, who's put more time into
different ways of printing th
On Windows 7, I have had no trouble using scribble --html. For the
first time in 5.1.3 I tried using scribble --pdf, and it does not
work. Does anyone recognize whether I'm doing something wrong?
ventoux ~/Desktop/r/sk/tycs> scribble --pdf doc.scrbl
run-pdflatex: did not generate a log file at d
In #lang scribble/manual, if I type
@codeblock{
#lang racket
}
the output (in HTML) has the word "racket" underlined, which seems
fair enough; ditto for
@codeblock{
#lang typed/racket
}
But if I type
@codeblock{
#lang planet foo/bar
}
only the word "planet" is underlined, which seems odd ("pl
Sorry, should have pointed that out. No, I don't see a log file.
There are no output files of any sort when scribble is done. I would
have anyway thought scribble was doing all this in some tmp directory
somewhere else.
Aha, I just found out that there's a scribble --latex option. I ran
that an
file?
>
> Robby
>
> On Sun, Sep 25, 2011 at 1:46 PM, Shriram Krishnamurthi
> wrote:
>> Sorry, should have pointed that out. No, I don't see a log file.
>> There are no output files of any sort when scribble is done. I would
>> have anyway thought scribb
No problem, thanks for trying. For now I anyway intended to publish
only HTML output. What I immediately wanted was to periodically test
to make sure the eventual PDF will look okay, and the two-step --latex
option is good enough for that.
If whoever maintains Scribble/Windows would like to work
Thanks, though I'm not sure that was my main point. Though I now see
that "planet" really is considered a whole language in its own right,
so I guess this red underlining is inevitable by the semantics.
Incidentally, for those who find this thread later, there's another
option you will may useful
Does the scribble/text language work in 5.1.3? Here's the first
example in the docs:
#lang scribble/text
Programming languages should
be designed not by piling
feature on top of feature, but
blah blah blah.
ventoux ~/Desktop/r/sk/gradelang> scribble try2.scrbl
dynamic-require: name is not provid
be run through scribble but others must be run through
racket.)
Shriram
On Mon, Sep 26, 2011 at 8:25 AM, Matthew Flatt wrote:
> At Sun, 25 Sep 2011 21:35:08 -0400, Eli Barzilay wrote:
>> 50 minutes ago, Shriram Krishnamurthi wrote:
>> > Does the scribble/text language
TOPLAS
Journal of Functional Programming
are both excellent choices. There are also other qualified venues such as
HOSC.
Shriram
--
Pardon terseness and mistakes -- sent from phone.
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I have two different files that provide a function called "isort".
One comes from untyped Racket and the other from typed/racket. I am
importing them thus:
(require [rename-in "untyped-sort-server.rkt"
(isort u:isort)])
(require [rename-in "typed-sort-server.rkt"
If you mean this library --
http://docs.racket-lang.org/plot/
-- I do use it in Scribble documents. (And it's just amazing that
with two lines of code I can have graphs in my HTML and PDF --
amazing.)
I would be able to easily swap it out for something else, though.
Shriram
___
check-within
http://docs.racket-lang.org/test-engine/index.html#(def._((lib._test-engine/racket-tests..rkt)._check-within))
On Tue, Oct 4, 2011 at 1:48 PM, Hendrik Boom wrote:
> On Tue, Oct 04, 2011 at 12:50:36PM -0400, Matthias Felleisen wrote:
>>
>> For testing, you want to use check-within be
> Some of the other commenters in that thread point out a few big things
> I missed, like Scribble.
Even more than Scribble is the fact that Racket enables Scribble to be
constructed in and then integrated into the language. The phrase "a
much, much more expressive macro system" is in your reddit
How about a synonym instead? I propose "Scheme". <-;
On Tue, Oct 4, 2011 at 8:09 AM, David Van Horn wrote:
> On 10/1/11 2:51 PM, Neil Toronto wrote:
>>
>> You know what would convince me the most? Find me a great name for the
>> new library that contains the word "plot". It should be clever and
I admire the consistency of this position - I really do - but we also have
check-error.
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John, have you run your audio stuff w/ world? How hard would that be?
On Wed, Oct 19, 2011 at 3:14 PM, Matthias Felleisen
wrote:
>
> No. -- Matthias
>
>
>
> On Oct 19, 2011, at 7:59 AM, Yaron Minsky wrote:
>
>> Is there any support for playing sounds within the Universe teachpack?
>>
>> y
>> ___
I'm missing why there are impersonators and chaperones for various
datatypes but not for lists. There's surely a good reason why, but I
am having trouble reconstructing what it might be. Anyone?
Shriram
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Thanks to you and Sam -- I had wondered if the run-time system wasn't
partly driving this, and certainly chaperones on immutable data don't
make as much sense. But I don't see them on mutable lists either
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I found this confusing when I first encountered it -- the patterns are
at the TOP of the page (but not linked from the match docs). Scroll
to the top and look for "pattern" in the BNF.
On Mon, Oct 31, 2011 at 3:16 PM, Jay McCarthy wrote:
> http://docs.racket-lang.org/htdp-langs/advanced.html
>
>
+1 on Windows for skull!
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You're missing the
PLaneT: Installing ...
line!
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Here's a program:
#lang racket
(define (even? n)
(if (zero? n) true (odd? (sub1 n
(define (odd? n)
(if (zero? n) false (even? (sub1 n
Go to Language | Choose Language, click on Show Details, and at the
top-right, select "Debugging and profiling".
Now run the program and in the inte
http://queue.acm.org/detail.cfm?id=2068896
If you participate in a social media site, you may want to post or
upvote it (it's already on Hacker News).
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> so the tools
> might let anybody do a new language, but the ability to use those
> tools seems to me to be a whole 'nother kettle of fish?
Obviously, a tool can be used to produce both good and bad artifacts.
But the better the tool, the easier time the toolsmith has with the
basics, so the more
Why don't you spend a little time writing down your thoughts, and then
post them. Maybe there are things that you're just missing that are
already in there. Or perhaps you find what you want but the path to
getting there is unintuitive, and seeing the feedback will help
improve the user experienc
On Nov 13, 2011, at 2:06 PM, Raoul Duke wrote:
>
> apparently i can't higlight a sub-section of code and "run" just that.
When you do this in Eclipse, what exact steps do you follow? And what
does Eclipse do in response? Can you show an example?
Thanks,
Shriram
> i do it in emacs usually if we are talking about being able to
> evaluate chunks.
But Emacs is not an IDE. You began by complaining that DrRacket is
not more like other traditional IDEs, and making platform-specific
complaints. Is there ANY sense in which Emacs is more
platform-specific than D
> having said that, "eminently sensible" is in the eye of the beholder.
> after all, racket didn't have static type checking for most of its
> life, no? i am not saying it is or is not eminent in my own view, i am
> pointing out that it is pretty subjective so you can't actually call
> it "eminentl
Right. A Racket Declaration of Independence. (-:
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Right. In other words, Racket would become a true scripting language. <-;
On Tue, Nov 15, 2011 at 3:14 PM, Grant Rettke wrote:
> On Mon, Nov 14, 2011 at 8:32 AM, Matthew Flatt wrote:
>> At Sun, 13 Nov 2011 21:00:55 +, "nicolas.o...@gmail.com" wrote:
>>> Is there a function to send to a clas
> Your question suggests that you come from a teaching language
> background where we introduce only local definitions. In ISL
> and ISL+lambda, the use of local makes it easier to move global
> transformations into a local scope and vice versa. Most importantly,
> these movement preserve the exact
DSSSL (-:
(Since I believe Bigloo and/or Gambit implemented DSSSL, lurking in
their implementations is code that does this...)
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Hi R. Noob,
> Do the URLs of pages that use continuation
> mechanism have to look ugly and cryptic?
Yes they do. The URLs are ugly *because* they are cryptic. They are
cryptic because it is a route to system security. If they were
pretty, people could guess them, and that would adversely affec
Let's just agree to ignore the troll, please.
Racket Users list:
http://lists.racket-lang.org/users
On Fri, Dec 30, 2011 at 2:54 PM, Noel Welsh wrote:
> On Tue, Dec 27, 2011 at 9:26 PM, Galler wrote:
>> I note that no one has discussed throwing a significant amount of physical
>> memory at the problem.
>>
>> Empirically, is that because garbage-collection of a large heap creates its
>> own perf
That's a fine position in theory, but I doubt it works well in
practice even today. When Jay talks about 3-4 GB, he doesn't mean
over the course of a conference -- that could sometimes add up in just
a few hours. No amount of cheap RAM is going to combat that.
But, as I said, in an Ajax world th
Hi all,
We have until now never barred anyone from this mailing list. We like
to keep it that way. Eli Barzilay and I talk about such issues
periodically, and have been doing so a LOT lately.
Trolls are obviously problematic. We're starting to get unsubscribe
messages, which does not help -- t
The Scribble language is a great instance of this, though
unfortunately there isn't yet really an easily accessible document
that lays out the argument crisply for a lay audience. But if you can
persist a little, try the Scribble ICFP paper.
Racket Users list:
http://lists
Thank you all for your kind words, both public and private.
You know the line about standing on shoulders, but it turns out that
if the shoulders you stand on are sufficiently tall, mere crouching is
sufficient. Those shoulders belong not only to Matthias but also
especially to Robby Findler, Cor
, please post them here:
https://plus.google.com/117185293319274359863/posts/9rfginQ3w82
I look forward to seeing you in class!
Shriram Krishnamurthi, Instructor
Joe Gibbs Politz, Associate Instructor
Racket Users list:
http://lists.racket-lang.org/users
I'm trying to start using scribble/lp and ran into some issues.
1. When I switch a buffer from scribble/base to scribble/lp, if I have
no chunks I get an error. Why is this? It certainly isn't needed for
typesetting; for assembling code during execution, when there are no
chunk's why isn't it eq
It also appears that one cannot scribble a stand-alone scribble/lp
file: it produces
dynamic-require: name is not provided
name: 'doc
...
(This, for instance, is scribbling the very example in
http://docs.racket-lang.org/scribble/lp.html .) But scribbling the
wrapper seems to work fine.
If tr
The function phone-directory consumes a name, then produces/computes a
phone number.
On Sat, Sep 8, 2012 at 11:26 AM, Richard Cleis wrote:
> I am writing documentation. What are acceptable words for the following
> brackets?
>
> The function f [what verbs are ok?] a name, then [what about here?]
I concur w/ Joe that there's something to be said for using "returns"
since you're presumably writing documentation that you want
non-Racketeer to read and immediately understand -- your goal here
(presumably) isn't to be pedantic. This is in contrast to a
programming or programming languages cour
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