raco | Generator based flow-control that supports both callback | Reactive Programming library
kandi X-RAY | raco Summary
kandi X-RAY | raco Summary
Generator based flow-control that supports both callback and promise. Many existing flow-control libraries such as co, assume promises to be the lowest denominator of async handling. Callback function requires promisify patch to be compatible, which creates unnecessary complication. In raco, both callbacks and promises are yieldable. Resulting function can be called by both callbacks and promises. This enables a powerful control flow while maintaining simplicity. Resolves a generator function. This does not return a Promise; uncaught error will be thrown. Yieldable callback works by supplying an additional next argument. Yielding non-yieldable value pauses the current generator, until next(err, val) being invoked by callback. val passes back to yielded value, or throw if err exists. Wraps a generator function into regular function that optionally accepts callback or returns a promise. Wraps generator methods of class or object.
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Trending Discussions on raco
QUESTION
I'm currently working on extending racklog, which is a library I installed by running raco pkg install
in the repo directory.
I'm trying to provide a new function, namely a struct constructor. Currently, I'm defining the struct as follows in racklog.rkt
. I then provide it from that file.
ANSWER
Answered 2020-Dec-17 at 06:17This is an unfortunate stale compiled file issue. Try raco setup --pkgs racklog
to compile racklog
and run your program again. It should now work. Alternatively, you can manually delete the compiled
directories.
QUESTION
I'm trying to get familiar with DrRacket plugin framework, and I'm using the following tutorial:
https://lang.video/blog/2018/03/21/making-an-ide-plugin-for-drracket/
I'm stuck at the step where raco is used:
When i run the command, my windows 10 operating system gives back the following error message, How can i solve this?:
'raco' is not recognized as an internal or external command, operable program or batch file.
second question:
I've also tried putting the clippy folder into a folder within my program files, in the DrRacket installation. Is this the location where Racket Plugins should reside, or can they be placed in any folder?
...ANSWER
Answered 2020-Nov-09 at 12:37Add racket
and raco
to your Windows PATH (the directories in which Windows looks for commands).
QUESTION
Hiii!
I'm writing my master thesis and I am struggling with the plots. I want to represent the juvenile fish abundances for each sampled site. This is what it looks like right now:
...ANSWER
Answered 2020-Oct-22 at 16:53I think I know what you're talking about: You're looking for something like the multiple rows in x axes that Excel PivotCharts give when you split your data multiple ways, right? I don't know of a way to do this in R without a lot of hacky workarounds. Instead, have you considered using small multiples to represent your data? Here's an example of small multiples for your data, still using ggplot2
. I have also removed the extra space between the 0 and the horizontal axis using expand =
within the scale_y_continuous
call.
Data I used:
QUESTION
The following code does not display newline after the prompt:
...ANSWER
Answered 2020-Aug-22 at 11:51read -p "prompt"
does not interpret escapes from the prompt string.
Although, a string literal can express control characters with escaping, if it uses the POSIX candidate ANSI-C style string syntax of: $'I am an ANSI-C style string\nin a shell script\n'
This type of string can be used for a Bash read -p
prompt string as:
QUESTION
Say I'm building an app in Racket.
And say eventually I want to compile that app as a single binary file that could be distributed to users, without them having Racket or any other software libs installed. I believe this is possible, yes?
Say in that app I want to use the snappy package https://docs.racket-lang.org/snappy/ which is some FFI wrappers around a C++ lib.
I already ran into a minor problem. I did (require snappy)
inside DrRacket and followed the prompts and got the package installed but I get the error:
ANSWER
Answered 2020-Jul-21 at 12:18There is a partial solution using a combination of raco distribute
and define-runtime-path
.
Suppose you have a program that uses libzmq, which you know is installed on your build system at /usr/lib/x86_64-linux-gnu/libzmq.so.5. You can use define-runtime-path
to create a reference to that file and tell raco distribute
to copy it to the distribution directory. For example, suppose that "my-app.rkt" is the following:
QUESTION
I’m trying to understand testing for packages in racket. And I wonder if anyone can give me an explainer on the idiomatic way to do package testing. So, I have a package in front of me (it’s someone else’s but I’m thinking about contributing) that has a few collections. The info.rkt looks a bit like this:
...ANSWER
Answered 2020-May-26 at 16:42This is an interesting question, and you may want to ask it on the Racket mailing list or Slack.
My recommendation is to assume that in most cases you must install a package to test it, especially if it contains multiple collections. In particular, I recommend assuming that requiring a module in another collection should always use an absolute module path instead of a relative path, even if they're in the same package. I was surprised that this doesn't seem to be enforced (based on one small test I did), but I wouldn't rely on the current lax behavior. I doubt Scribble can handle relative module names (but I haven't checked), so if your definition of "testing" includes building and checking the docs, that's another reason installation would be needed.
QUESTION
When trying to install the iracket kernel, it throws
...ANSWER
Answered 2020-Apr-13 at 08:28The iracket install command needs to run the jupyter.exe
command to find the directory where Jupyter kernels are stored. So you need to find where pip installed jupyter.exe
and then add the directory containing jupyter.exe
to your PATH, or you need to run the iracket install script with raco iracket install --jupypter-exe path-to-jupyter.exe
.
QUESTION
I'm attempting to link to Scribble docs provided by a third party (as opposed to core) library (specifically, data/collection), but I'm having trouble getting it to work.
With these imports:
...ANSWER
Answered 2020-Mar-15 at 11:29The problem is that you only install collections-lib
. This does not include its documentation which lives at collections-doc
.
So either install the package collections-doc
or the (meta-)package collections
which will include both collections-lib
and collections-doc
. Then, run raco setup relation
to re-render your documentation. This would suffice for your own builds.
You probably should also modify info.rkt
so that other people who install your package download the desired dependencies. There are a couple of ways to set this up.
- An easy way is to put
collections
indeps
, which will require users to install the meta-packagecollections
, hence installing bothcollections-lib
andcollections-doc
. - A more difficult way is put
collections-lib
indeps
(you did this already) and putcollections-doc
inbuild-deps
. An advantage of this approach is that users won't be required to download all tools necessary for building documentation if they install your package as a binary package (which will pre-renders the documentation already).
QUESTION
I am running a minimal install of Racket and wish to install the sql package. If I try the command:
...ANSWER
Answered 2020-Mar-06 at 01:53--no-docs
means it will not setup documentation, but it is still a dependency!
Note however that sql
's info.rkt
indicates racket-doc
as a built-deps
. That means if you install a binary package from the built-package catalog, racket-doc
will no longer be a dependency.
(Note: this solution is due to Jack Firth)
As a first step, we need to add the built-package catalog to the list of catalogs that raco pkg
will use by default. This could be done by:
QUESTION
ANSWER
Answered 2020-Feb-29 at 16:39You are encoding the raw cv2 image data as base64, which your web browser won't understand. You need to encode the raw image data to jpg and then encode it.
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