continuation | JavaScript asynchronous Continuation-Passing Style | Interpreter library
kandi X-RAY | continuation Summary
kandi X-RAY | continuation Summary
Continuation.js is a compiler for Continuation-Passing Style transformation, which simplifies asynchronous JavaScript programming. It translates slightly flavored JavaScript syntax into standard JavaScript, so it can be also called a "translator". Continuation.js introduces a virtual function cont, which allow you to write continuation-passing style code (or asynchronous callback style code) far easier. cont is not a actual function, but a mark with the same syntax to function calls in JavaScript. By using Continuation.js you can write asynchronous control flows like flat threaded code, and it compiles it into continuation-passing style code.
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Top functions reviewed by kandi - BETA
- loop through array
- loop through array
- Opens a node .
- the main loop
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- loop for array
- responsible for looping
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- Recursive function to calculate the size of block size
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continuation Key Features
continuation Examples and Code Snippets
Lines of Code : 120
License : No License
Copyobj.doStuff.before(function(next, someValue) {
console.log("Pre-invocation step. We can see the value is: " + someValue);
next(someValue);
});
var obj = {
doStuff: function(someValue) {
console.log("The actual method is doing stu some_fancy_function( arg, {CPS:var_name} );
....more commands
....and maybe more
} // <= the closing brace of the immediate environment where some_fancy_function is located
some_fancy_function( arg, function(var_name)
// Give me the promise remote/browser!
this.browser = this.webdriver.browser('promise');
// or
// Give me the promise chain remote/browser!
this.browser = this.webdriver.browser('promiseChain');
// or
// Give me the regular continuation style rem def _unfold_continuations(code_string):
"""Removes any backslash line continuations from the code."""
return code_string.replace('\\\n', '') Community Discussions
Trending Discussions on continuation
QUESTION
Suppose I want to model, using Haskell pipes, a Python
Generator[int, None, None]which keeps some internal state. Should I be usingProducer int (State s) ()orStateT s (Producer int m) (), wheremis whatever type of effect I eventually want from the consumer?How should I think about the notion of transducers in pipes? So in Oleg's simple generators, there is
...
ANSWER
Answered 2022-Mar-31 at 18:32In pipes, you typically wouldn't use effects in the base monad m of your overall Effect to model the internal state of a Producer. If you really wanted to use State for this purpose, it would be an internal implementation detail of the Producer in question (discharged by a runStateP or evalStateP inside the Producer, as explained below), and the State would not appear in the Producer's type.
It's also important to emphasize that a Producer, even when it's operating in the Identity base monad without any "effects" at its disposal, isn't some sort of pure function that would keep producing the same value over and over without monadic help. A Producer is basically a stream, and it can maintain state using the usual functional mechanisms (e.g., recursion, for one). So, you definitely don't need a State for a Producer to be stateful.
The upshot is that the usual model of a Python Generator[int, None, None] in Pipes is just a Monad m => Producer Int m () polymorphic in an unspecified base monad m. Only if the Producer needs some external effects (e.g., IO to access the filesystem) would you require more of m (e.g., a MonadIO m constraint or something).
To give you a concrete example, a Producer that generates pseudorandom numbers obviously has "state", but a typical implementation would be a "pure" Producer:
QUESTION
In my application I need to schedule executing of some Actions with delay. It's like setTimeout in JavaScript. Also, when app execution ends I need to cancel all scheduled executions that have not been executed yet. So I have to call Task.Delay without await and pass CancellationToken into it. But if I do so, I face with memory leak: none of CancellationTokenSource+CallbackNode will be disposed until I call Cancel and Dispose of CancellationTokenSource from which I take CancellationTokens to pass to Task.Delay.
Minimal reproducible example:
...ANSWER
Answered 2022-Mar-12 at 10:46I was a bit surprised, but it looks like this is on purpose. When a registration is cancelled, CancellationTokenSource still keeps the instance of CancellationTokenSource+CallbackNode in a free-list to reuse it for the next callback. This is an opiniated optimization, that can backfire in your scenario.
To illustrate this, try running your test twice in a row:
QUESTION
I am new to Arrow and try to establish my mental model of how its effects system works; in particular, how it leverages Kotlin's suspend system. My very vague understanding is as follows; if would be great if someone could confirm, clarify, or correct it:
Because Kotlin does not support higher-kinded types, implementing applicatives and monads as type classes is cumbersome. Instead, arrow derives its monad functionality (bind and return) for all of Arrow's monadic types from the continuation primitive offered by Kotlin's suspend mechanism. Ist this correct? In particular, short-circuiting behavior (e.g., for nullable or either) is somehow implemented as a delimited continuation. I did not quite get which particular feature of Kotlin's suspend machinery comes into play here.
If the above is broadly correct, I have two follow-up questions: How should I contain the scope of non-IO monadic operations? Take a simple object construction and validation example:
...ANSWER
Answered 2022-Jan-31 at 08:52I don't think I can answer everything you asked, but I'll do my best for the parts that I do know how to answer.
What is the recommended way to implement non-IO monad comprehensions in Arrow without making all functions into suspend functions? Or is this actually the way to go?
you can use nullable.eager and either.eager respectively for pure code. Using nullable/either (without .eager) allows you to call suspend functions inside. Using eager means you can only call non-suspend functions. (not all effectual functions in kotlin are marked suspend)
Second: If in addition to non-IO monads (nullable, reader, etc.), I want to have IO - say, reading in a file and parsing it - how would i combine these two effects? Is it correct to say that there would be multiple suspend scopes corresponding to the different monads involved, and I would need to somehow nest these scopes, like I would stack monad transformers in Haskell?
You can use extension functions to emulate Reader. For example:
QUESTION
Looking into UTF8 decoding performance, I noticed the performance of protobuf's UnsafeProcessor::decodeUtf8 is better than String(byte[] bytes, int offset, int length, Charset charset) for the following non ascii string: "Quizdeltagerne spiste jordbær med flØde, mens cirkusklovnen".
I tried to figure out why, so I copied the relevant code in String and replaced the array accesses with unsafe array accesses, same as UnsafeProcessor::decodeUtf8.
Here are the JMH benchmark results:
ANSWER
Answered 2022-Jan-12 at 09:52To measure the branch you are interested in and particularly the scenario when while loop becomes hot, I've used the following benchmark:
QUESTION
In WWDC 2021 video, Protect mutable state with Swift actors, they provide the following code snippet:
...ANSWER
Answered 2022-Jan-05 at 00:30The key is to keep a reference to the Task, and if found, await its value.
Perhaps:
QUESTION
I've been getting familiar with the ContinuationInterceptor section of coroutines
I wrote the following section of code to verify my idea
ANSWER
Answered 2022-Jan-03 at 10:40The behavior of the shown code is weird. I couldn't find the exact reason why.
I fixed some obvious problems with your code, such as returning a new object from key every time, and not implementing equals. I return a singleton, so the default equals works:
QUESTION
I have a networking layer that currently uses completion handlers to deliver a result on the operation is complete.
As I support a number of iOS versions, I instead extend the network layer within the app to provide support for Combine. I'd like to extend this to now also a support Async/Await but I am struggling to understand how I can achieve this in a way that allows me to cancel requests.
The basic implementation looks like;
...ANSWER
Answered 2021-Oct-10 at 13:42async/await might not be the proper paradigm if you want cancellation. The reason is that the new structured concurrency support in Swift allows you to write code that looks single-threaded/synchronous, but it fact it's multi-threaded.
Take for example a naive synchronous code:
QUESTION
How does Task.Yield work under the hood in Mono/WASM runtime (which is used by Blazor WebAssembly)?
To clarify, I believe I have a good understanding of how Task.Yield works in .NET Framework and .NET Core. Mono implementation doesn't look much different, in a nutshell, it comes down to this:
ANSWER
Answered 2021-Nov-28 at 11:17It’s setTimeout. There is considerable indirection between that and QueueUserWorkItem, but this is where it bottoms out.
Most of the WebAssembly-specific machinery can be seen in PR 38029. The WebAssembly implementation of RequestWorkerThread calls a private method named QueueCallback, which is implemented in C code as mono_wasm_queue_tp_cb. This in invokes mono_threads_schedule_background_job, which in turn calls schedule_background_exec, which is implemented in TypeScript as:
QUESTION
The continuation of my previous question, I am able to find a way to capture a live screen without own window with help of WinRT's Windows.Graphics.Capture. I can concentrate directly on a particular window handle to get live capture. now, the problem with this approach is I am not able to apply pixel shader. The question Applying HLSL Pixel Shaders to Win32 Screen Capture having the same requirement but the answer to that question is not solving my problem.
Code with more information:
...ANSWER
Answered 2021-Sep-22 at 13:38everything was correct except the copy resource call was missing once the new frame arrives.
QUESTION
There are plenty of classes in .NET standard library that have no interfaces. It ignores the dependency inversion principle. There is the same story with static methods. But we can fluently adapt them like
...ANSWER
Answered 2021-Nov-02 at 21:02Frankly I don't know how to implement what you are looking for. However, there is a easy workaround with minimal syntax. The idea is you await GetBAsync convert B to A, wrap A in a task and then return it. It is a extra-step, but a simple one:
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