async
redux-saga
async | redux-saga | |
---|---|---|
16 | 42 | |
28,077 | 22,504 | |
- | -0.0% | |
8.1 | 4.0 | |
4 days ago | 26 days ago | |
JavaScript | JavaScript | |
MIT License | MIT License |
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async
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Avoid the Promise.all pitfall
Well you could just install the async package which has lots of useful functions like mapLimit which will reduce the burden and only run a number in parallel.
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What is this callback in async.parallel function?
Have you checked out the docs for the async library they are using?
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How to limit concurrency with Python asyncio?
Edit:2. What's a good library that takes care of common async patterns? (Something like async)
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I Avoid Async/Await
Async/await is certainly not promises. In fact it would be much better implemented without promises as I proposed here: https://es.discourse.group/t/callback-based-simplified-async...
I would even say that async/await is anti-promise, it takes the main functionality of promises, a caching layer for results and errors that allows you to add the code continuation later and elsewhere (which is a major footgun imo) and coerces the execution flow back to going on the next line and provided immediately at compile time which results in a cleaner flow but not as clean, stateless, efficient or functional as if you were to remove the promises completely. Having an additional caching layer and state machine around every asynchronous function call is quite inefficient.
The essence of async/await is not promises, it's the underlying javascript generator (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...) functionality combined with asynchronous code to stop and start the generator. It's the ability to pause and resume function execution based on asynchronous operations.
The promise functionality, the caching layer and state machine for results is basically sanitized away with async/await, it becomes dead-weight computation. The only benefit of promises in async/await code is being able to more easily interface with other promise laden code which you don't need once you have async/await and a library like https://www.npmjs.com/package/async for more complex cases.
Note that promises based async/await is also a mess of an implementation that breaks stack traces and needs to support tons of odd statement corner cases (basically anything that can return an object that could be a promise) whereas a continuation passing style async/await would be a much simpler implementation that would only apply to function calls and maintain stack traces. We get that stack trace support automatically because of the great work of whoever implemented javascript generators which seem to already carry stack traces across paused/resumed functions (if you don't wrap in promises).
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What is the difference between async.waterfall and async.series
The nodejs async module: https://github.com/caolan/async provides 2 similar methods, async.waterfall and async.series.
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JavaScript ES6 promise for loop [duplicate]
With async I'd simply use async.series().
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Some questions about events and promises
I don't understand. Sure you could spawn a ton of processes, but things might be bogged down. There are utilities out there for doing work queues.... so only N workers are running at any one time. The async library has some utilities for that. https://github.com/caolan/async
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Caolan Asyncjs vs Async/Await: Which One to Use for Async Operations in NodeJS
The documentation of asyncjs is quite straightforward and easy to read. As we've only seen a couple of use cases in this article, I'd recommend to go the asyncjs documentation and check out other possibilities with the library. You can also try to replicate the same using async/await to solidify your understanding of where the library might still make sense.
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[AskJS] How were asynchronous functions written before Promises?
It basically was tons and tons of callbacks. They'd nest weirdly deep and be a pain to work with. If you're curious, here's a link to one of my favorite JavaScript libraries from those days - it gave you a bunch of neat utilities for dealing with async code.
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Aren't promises just callbacks?
api(function(result){ api2(function(result2){ api3(function(result3){ // do work }); });}); Which I could use a library like async for anyway, with something like:
redux-saga
- Main-Thread-Scheduling
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Creating Own Chat GPT
For the backend, we chose Python, Django Rest Framework. On the frontend, React, Redux, Saga, Sass. Let’s start with the backend, which was managed by Yegor. He writes about the server part of the project himself.
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Internals of Async / Await in JavaScript
The whole article properly the best explanation of generators I have come across. This quote stuck out:
> Generators are a special type of function that can return multiple pieces of data during its execution. Traditional functions can return multiple data by using structures like Arrays and Objects, but Generators return data whenever the caller asks for it, and they pause execution until they are asked to continue to generate and return more data.
Applications of generators? I have only used Redux-Saga[1]. Can't even think of other libraries that use them, but would be interested in learning.
[1]: https://redux-saga.js.org/
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Generators in the wild
redux-saga. The most popular effects library in js
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I don't get why I should use Redux
Redux can be extended with a lot of other packages. For example with a side effect manager, you can separate side effects from your business logic, help with error handling and in the same process make testing of side effects a lot easier.
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What Is The Best Name for This Synchronous Function?
Consumer vs. Producer: Check out Redux Saga
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Front-end Guide
Your app will likely have to deal with async calls like making remote API requests. redux-thunk and redux-saga were created to solve those problems. They may take some time to understand as they require understanding of functional programming and generators. Our advice is to deal with it only when you need it.
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Why Would Anyone Need JavaScript Generator Functions?
Hey thanks for the thoughtful response.
I agree with everything you mentioned here. I'd love to continue to chat with you about how to make testing sagas better.
If you'd like, it would be great if we could move this convo to https://github.com/redux-saga/redux-saga/discussions/2337
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What is the best plan to catch data from multiple api calls and display some data
If there are dependent API calls, you can probably look at redux-saga. It’s one of the best libraries out there to manage the data.
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[AskJS] Where will I need to write generator functions?
redux-saga makes use of them in really nice way. https://redux-saga.js.org/ That’s where I’ve used them the most.
What are some alternatives?
Bluebird - :bird: :zap: Bluebird is a full featured promise library with unmatched performance.
redux-toolkit - The official, opinionated, batteries-included toolset for efficient Redux development
moment - Parse, validate, manipulate, and display dates in javascript.
react-query - 🤖 Powerful asynchronous state management, server-state utilities and data fetching for TS/JS, React, Solid, Svelte and Vue. [Moved to: https://github.com/TanStack/query]
q - A promise library for JavaScript
rtk-query - Data fetching and caching addon for Redux Toolkit
contra - :surfer: Asynchronous flow control with a functional taste to it
axios - Promise based HTTP client for the browser and node.js
neo-async - Neo-Async is thought to be used as a drop-in replacement for Async, it almost fully covers its functionality and runs faster
SWR - React Hooks for Data Fetching
Simple-Series-Parallel - A minimalist utility module for running async functions in series or parallel
Immer - Create the next immutable state by mutating the current one