async
lodash
async | lodash | |
---|---|---|
16 | 187 | |
28,077 | 58,909 | |
- | 0.3% | |
8.1 | 5.1 | |
4 days ago | 4 days ago | |
JavaScript | JavaScript | |
MIT License | GNU General Public License v3.0 or later |
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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:
lodash
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8 NPM Packages for JavaScript Beginners [2024][+tutorials]
Lodash.js is like the Swiss Army knife for JavaScript developers. Need to manipulate data structures or dabble in functional programming? Lodash is here to save the day with its arsenal of utilities. It's all about making your code cleaner and your life easier, which is probably why big guns like Google and Airbnb have it in their toolkit.
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Full Stack Web Development Concept map
lodash - utility library enabling things like deep object comparison that aren't easy to do with javascript out of the box. docs
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Getting Started with Lodash: A Beginner's Guide to JavaScript Utility Functions
Lodash is a widely used JavaScript utility library that provides a plethora of functions to simplify common programming tasks. From manipulating arrays and objects to handling edge cases and implementing functional programming paradigms, Lodash offers a comprehensive toolkit for JavaScript developers. In this beginner's guide, we'll learn how to get started with Lodash and leverage its functionality to write cleaner, more efficient, and more maintainable code.
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JavaScript Libraries That You Should Know
5. Lodash
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JavaScript Equality Under the Lens: Enhancing React's Dependency Checks
If you want even more sophisticated equality checks like deep comparisons, there's the: lodash.iseQual library that'll do this for you out of the box. At least now you do have a bit of clarity on what's happening under the hood, so there's no harm in using a library.
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Top 20 Frontend Interview Questions With Answers
It's also important to ensure that you're importing libraries correctly, so webpack can perform tree shaking effectively. For example, let's import lodash, as follows:
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How to Remove Duplicate Objects from an Array in JavaScript
Lodash is awesome! It’s a JavaScript library that helps you do many things with data. You can use Lodash to manipulate arrays, objects, JavaScript strings, numbers, and more. It’s easy to get Lodash in your project. You can use npm or a CDN to install and import it. Here’s how:
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Observables and Observers in RxJS
Think of RxJS as Lodash for events.
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Coming to grips with JS: a Rubyist's deep dive
lodash and You Might Not Need Lodash
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Deep Cloning Objects in JavaScript, the Modern Way
A lot of Lodash functions are implemented as combinations of other Lodash functions, so importing a single function actually imports half of Lodash under the hood:
https://github.com/lodash/lodash/blob/main/src/.internal/bas...
What are some alternatives?
Bluebird - :bird: :zap: Bluebird is a full featured promise library with unmatched performance.
ramda - :ram: Practical functional Javascript
moment - Parse, validate, manipulate, and display dates in javascript.
underscore - JavaScript's utility _ belt
q - A promise library for JavaScript
lazy.js - Like Underscore, but lazier
contra - :surfer: Asynchronous flow control with a functional taste to it
RxJS
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
Sugar - A Javascript library for working with native objects.
Simple-Series-Parallel - A minimalist utility module for running async functions in series or parallel
immutable-js - Immutable persistent data collections for Javascript which increase efficiency and simplicity.