async
Nodemon.io
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async | Nodemon.io | |
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16 | 137 | |
28,077 | 26,009 | |
- | - | |
8.1 | 7.8 | |
4 days ago | 11 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:
Nodemon.io
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Full Stack Web Development Concept map
nodemon - enables automatic reload of your server after code change docs
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Devlog Week 3: 4 - 10 December 2023
Then, install nodemon (in the VSCode terminal also), which, to my understanding, automatically refreshes the server you'll be sending requests to, whenever you make a change. Using plain node.js, you'd have to manually stop and restart the server after every change.
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Say Goodbye to Docker Volumes 👋
That's already pretty good, but as you already know it's a PITA to work with this during development. You will have to rebuild your Docker images whenever you change your code, even though your apps will probably support hot-reloading out of the box (or with something like Nodemon if not).
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Set up Hot Reload for Typescript ESM projects
Are you moving your projects to use ES Modules but you are facing some unexpected issues? You are not alone in this fight. In this tutorial, you will learn how to set up nodemon along with ts-node.
- Guia para Iniciantes: Criando uma API com Node.js, PostgreSQL e Padrão MVC
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Building a React/Express Stripe Donation Form
We can now use npm run dev to start the server using nodemon, which enables hot refreshing on changes.
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Best ways to fix Nodemon error- nodemon.ps1 cannot be loaded because running scripts is disabled on this system.
Welcome to my blog, where we dive into the intriguing world of Node.js development and tackle one of the common stumbling blocks many developers encounter: the "Nodemon Error - nodemon.ps1 cannot be loaded because running scripts is disabled on this system." If you've ever come across this error while working with Nodemon, fear not! In this article, we will explore the causes behind this issue, understand why scripts are disabled on certain systems and most importantly, provide you with practical solutions to overcome this obstacle and keep your development workflow seamless. So, let's embark on this troubleshooting journey together and empower ourselves to conquer the Nodemon Error!
- Nodemon not watching for file changes
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Setting Up Recurring Charges with the Rapyd Collect API
You’ll need to restart the server using node index.js whenever you change any project file. You can also use Nodemon to automate this.
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Add payments feature in your application using Node.js/Express and Stripe
nodemon will be required to monitor for any changes in our source code and automatically restart our server.
What are some alternatives?
Bluebird - :bird: :zap: Bluebird is a full featured promise library with unmatched performance.
PM2 - Node.js Production Process Manager with a built-in Load Balancer.
moment - Parse, validate, manipulate, and display dates in javascript.
supervisor
q - A promise library for JavaScript
forever - A simple CLI tool for ensuring that a given script runs continuously (i.e. forever)
contra - :surfer: Asynchronous flow control with a functional taste to it
chokidar - Minimal and efficient cross-platform file watching library
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
supervisor - Supervisor process control system for Unix (supervisord)
Simple-Series-Parallel - A minimalist utility module for running async functions in series or parallel
Phusion Passenger - A fast and robust web server and application server for Ruby, Python and Node.js