async vs bluebird vs fp-ts vs neverthrow vs folktale vs monet
JavaScript Promise and Functional Libraries Comparison
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What's JavaScript Promise and Functional Libraries?

This collection of libraries provides various approaches to handling asynchronous programming and functional programming paradigms in JavaScript. Each library offers unique features and methodologies for managing asynchronous operations, error handling, and functional programming constructs, catering to different developer preferences and project requirements. They enhance code readability, maintainability, and overall application performance by providing structured ways to deal with asynchronous flows and functional patterns.

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async59,618,09728,234808 kB139 months agoMIT
bluebird28,647,98020,470-1225 years agoMIT
fp-ts2,913,80411,1164.74 MB19121 days agoMIT
neverthrow780,8275,431112 kB553 months agoMIT
folktale74,5512,044-306 years agoMIT
monet11,1981,60180.4 kB34-MIT
Feature Comparison: async vs bluebird vs fp-ts vs neverthrow vs folktale vs monet

Asynchronous Control Flow

  • async:

    Async provides a straightforward approach to managing asynchronous control flow using functions like waterfall, parallel, and series. It allows developers to write cleaner code by avoiding deeply nested callbacks, making it easier to follow the flow of asynchronous operations.

  • bluebird:

    Bluebird enhances native Promises with additional methods and utilities, allowing for more complex asynchronous control flows. It supports chaining, parallel execution, and error handling, making it a powerful tool for managing multiple asynchronous tasks efficiently.

  • fp-ts:

    fp-ts provides functional abstractions for handling asynchronous operations, such as Task and IO. These types allow for composing asynchronous actions in a functional manner, making it easier to reason about side effects and control flow in your applications.

  • neverthrow:

    Neverthrow focuses on error handling rather than control flow. It allows you to wrap asynchronous operations in a way that clearly distinguishes between success and failure, promoting a more predictable error handling strategy.

  • folktale:

    Folktale does not focus on asynchronous control flow directly but provides functional constructs that can be combined with async operations. Its Task type can be used to represent asynchronous computations in a functional style, promoting cleaner code organization.

  • monet:

    Monet offers a Future type that represents a value that may be available now or in the future, allowing for a functional approach to asynchronous programming. It supports combinators for composing and transforming asynchronous operations seamlessly.

Error Handling

  • async:

    Async relies on traditional callback error handling, which can lead to callback hell. While it allows for error propagation through callbacks, it does not provide a structured way to handle errors in asynchronous flows.

  • bluebird:

    Bluebird provides robust error handling capabilities through Promise chaining. It allows you to catch errors at any point in the promise chain, making it easier to manage errors in complex asynchronous workflows.

  • fp-ts:

    fp-ts offers the Either and Option types, which can be used for error handling in a functional style. This allows you to handle errors and optional values without relying on exceptions, promoting a more predictable codebase.

  • neverthrow:

    Neverthrow is specifically designed for error handling, providing a clear distinction between success and failure without throwing exceptions. It allows you to handle errors in a functional manner, improving code readability and maintainability.

  • folktale:

    Folktale introduces the Either and Maybe types for error handling, allowing you to represent computations that may fail or return no value. This functional approach helps in managing errors more explicitly and can lead to cleaner code.

  • monet:

    Monet provides Either and Maybe types as well, allowing for expressive error handling. It encourages the use of functional patterns to manage errors, making your code more robust and easier to maintain.

Functional Programming Support

  • async:

    Async does not inherently support functional programming paradigms but can be used in conjunction with functional techniques. It is primarily focused on control flow rather than functional constructs.

  • bluebird:

    Bluebird offers some functional programming utilities, but its primary focus is on Promises. It allows for chaining and functional-style error handling, but it is not a full-fledged functional programming library.

  • fp-ts:

    fp-ts is a library designed for functional programming in TypeScript. It provides a wide range of functional abstractions, allowing developers to write code that adheres to functional programming principles, such as immutability and higher-order functions.

  • neverthrow:

    Neverthrow is focused on error handling in a functional style, providing a clean way to represent success and failure. While it is not a full functional programming library, it encourages a functional approach to error management.

  • folktale:

    Folktale is built around functional programming principles, providing a rich set of functional data types and utilities. It encourages a functional approach to programming, making it ideal for developers who want to embrace functional paradigms.

  • monet:

    Monet combines functional programming with a comprehensive set of data types and utilities. It promotes a functional approach to programming, making it suitable for projects that prioritize functional composition and immutability.

Performance

  • async:

    Async is lightweight and performs well for simple asynchronous tasks. However, it may not be as efficient for complex scenarios compared to Promise-based libraries due to its callback nature.

  • bluebird:

    Bluebird is optimized for performance and can handle a large number of asynchronous operations efficiently. Its advanced features, such as cancellation and concurrency control, make it suitable for high-performance applications.

  • fp-ts:

    fp-ts is designed to be efficient in handling functional programming patterns, but its performance can vary based on how abstractions are utilized. It is generally performant for TypeScript projects that leverage its features effectively.

  • neverthrow:

    Neverthrow is lightweight and focuses on error handling rather than performance optimization. It is designed to be efficient in managing success and failure states without the overhead of traditional error handling.

  • folktale:

    Folktale's performance is generally good for functional programming tasks, but it may not be as optimized for asynchronous operations as Promise-based libraries. Its focus is more on functional constructs than raw performance.

  • monet:

    Monet is optimized for functional programming and provides efficient data structures and utilities. Its performance is generally good, but it may not match the raw speed of more specialized asynchronous libraries.

Learning Curve

  • async:

    Async has a relatively low learning curve, especially for developers familiar with callback patterns. Its straightforward API makes it easy to get started with asynchronous programming.

  • bluebird:

    Bluebird has a moderate learning curve due to its extensive feature set. While basic usage is simple, mastering its advanced features may take some time for new users.

  • fp-ts:

    fp-ts has a steep learning curve, especially for developers new to functional programming and TypeScript. Its advanced abstractions and type system can be challenging to grasp initially.

  • neverthrow:

    Neverthrow has a low learning curve, as it focuses on simplifying error handling. Its API is straightforward, making it easy for developers to integrate into their projects.

  • folktale:

    Folktale has a steeper learning curve, particularly for developers unfamiliar with functional programming concepts. Understanding its data types and how to use them effectively may require additional effort.

  • monet:

    Monet's learning curve is moderate, as it combines functional programming with familiar JavaScript concepts. Developers with a functional programming background may find it easier to adopt.

How to Choose: async vs bluebird vs fp-ts vs neverthrow vs folktale vs monet
  • async:

    Choose Async if you need a simple and straightforward way to handle asynchronous JavaScript with a focus on control flow. It is ideal for projects that require a lightweight solution without the complexity of Promises or async/await.

  • bluebird:

    Select Bluebird if you require a robust Promise implementation with advanced features such as cancellation, progress notifications, and performance optimizations. It is suitable for applications that heavily rely on Promises and need extensive functionality.

  • fp-ts:

    Choose fp-ts if you want to leverage TypeScript's type system to implement functional programming paradigms. It offers powerful abstractions like Functors, Monads, and Applicatives, making it ideal for TypeScript projects that require strong type safety and functional constructs.

  • neverthrow:

    Choose Neverthrow if you want a library specifically designed for error handling in a functional style. It provides a clean way to represent success and failure without throwing exceptions, making your code more predictable and easier to reason about.

  • folktale:

    Opt for Folktale if you are looking for a library that emphasizes functional programming principles. It provides a suite of functional programming tools, including Maybe and Either types, which can help in managing errors and optional values in a more expressive way.

  • monet:

    Select Monet if you prefer a library that combines functional programming with a rich set of data types and utilities. It provides a comprehensive set of features for working with functional programming patterns in JavaScript, making it suitable for projects focused on immutability and functional composition.

Similar Npm Packages to async

async is a utility module that provides powerful functions for working with asynchronous JavaScript. It simplifies the process of managing asynchronous operations, allowing developers to write cleaner and more maintainable code. With features like parallel execution, series execution, and control flow, async is particularly useful for handling complex asynchronous workflows. However, there are several alternatives in the JavaScript ecosystem that also provide similar functionalities. Here are a few notable ones:

  • bluebird is a fully-featured promise library that offers a wide range of utilities for working with promises. It enhances the native Promise functionality by providing additional features such as cancellation, progress tracking, and more robust error handling. bluebird is known for its performance and is a great choice for developers looking for an advanced promise library that can handle complex asynchronous tasks with ease.

  • p-map is a lightweight utility that allows you to map over an array asynchronously, executing a provided function for each element in parallel. It is particularly useful when you need to perform asynchronous operations on an array of items and want to control the concurrency level. p-map is simple to use and can be a great alternative for scenarios where you need to process multiple asynchronous tasks without the overhead of a larger library.

  • q is another promise library that focuses on providing a simple and straightforward API for working with asynchronous code. It was one of the earlier promise libraries in the JavaScript ecosystem and offers features like chaining, error handling, and more. While it may not be as feature-rich as some of the newer libraries, q is still a solid choice for developers looking for a lightweight solution for managing asynchronous operations.

To see how async compares with bluebird, p-map, and q, check out the comparison: Comparing async vs bluebird vs p-map vs q.

Similar Npm Packages to bluebird

bluebird is a fully-featured promise library for JavaScript that provides a powerful and flexible way to work with asynchronous operations. It enhances the native JavaScript promises by adding a wide range of features, such as cancellation, progress reporting, and more robust error handling. Bluebird is particularly useful for developers who need to manage complex asynchronous workflows and want to take advantage of its performance optimizations.

While Bluebird is a popular choice for promise management, there are several alternatives available in the JavaScript ecosystem. Here are a few noteworthy options:

  • lie is a lightweight promise library that aims to provide a simple and minimalistic implementation of the Promise/A+ specification. It is designed for developers who need a straightforward promise solution without the additional features and overhead that come with larger libraries like Bluebird. Lie is particularly useful for smaller projects or when you want to keep your dependencies minimal.

  • q is another promise library that offers a rich set of features for managing asynchronous operations. It was one of the first libraries to implement the promise concept in JavaScript and provides a variety of utilities for working with promises, such as chaining, error handling, and more. Q is a good choice for developers who need a robust promise implementation with a focus on compatibility and performance.

  • rsvp is a promise library that was created to provide a simple and reliable implementation of promises for JavaScript. It includes features like promise chaining, error handling, and the ability to handle multiple promises concurrently. RSVP is particularly useful for developers who want a straightforward promise solution that is easy to use and integrates well with existing codebases.

  • when is a promise library that focuses on providing a powerful and flexible way to work with asynchronous operations. It offers features like chaining, error handling, and the ability to combine multiple promises. When is a great option for developers who need a comprehensive promise library that can handle complex asynchronous workflows.

To see how Bluebird compares with lie, q, rsvp, and when, check out the comparison: Comparing bluebird vs lie vs q vs rsvp vs when.

Similar Npm Packages to fp-ts

fp-ts is a functional programming library for TypeScript that provides tools for working with functional programming concepts and patterns. It allows developers to write more predictable and maintainable code by leveraging types and functional constructs. While fp-ts offers a robust set of features for functional programming, there are other libraries in the JavaScript ecosystem that provide similar capabilities. Here are a few alternatives:

  • immutable is a library that provides immutable data structures, which can help prevent unintended side effects in your applications. It focuses on performance and ease of use, offering a set of data structures like List, Map, and Set that are designed to be used in a functional programming style. If you are looking to manage state in a predictable way while ensuring immutability, immutable is a solid choice.
  • ramda is a functional programming library that emphasizes a functional style of programming with a focus on simplicity and composability. It provides a wide range of utility functions that can be easily composed to create more complex operations. Ramda is particularly useful for developers who want to adopt a functional programming approach without the constraints of TypeScript. If you prefer a library that is more focused on utility functions and less on types, ramda is a great option.
  • rxjs is a library for reactive programming using Observables, which makes it easy to compose asynchronous or callback-based code. While it is not strictly a functional programming library, it incorporates many functional programming principles and allows developers to work with streams of data in a functional way. If your application requires handling asynchronous data streams or events, rxjs provides powerful tools for managing these scenarios.

To see how fp-ts compares with immutable, ramda, and rxjs, check out the comparison: Comparing fp-ts vs immutable vs ramda vs rxjs.

Similar Npm Packages to neverthrow

neverthrow is a TypeScript library designed to handle errors in a functional programming style. It provides a way to represent computations that can either succeed or fail without throwing exceptions, making error handling more predictable and manageable. By using the Result type, developers can explicitly handle success and failure cases, leading to cleaner and more maintainable code. This approach encourages a more functional style of programming, reducing the reliance on traditional error handling methods.

While neverthrow is a powerful tool for error handling, there are several alternatives in the JavaScript ecosystem that also provide similar capabilities. Here are a few noteworthy options:

  • async is a utility module that provides functions for working with asynchronous JavaScript. It offers a variety of methods to manage asynchronous control flow, including error handling. While it is not solely focused on error handling, it provides robust tools for managing async operations, making it easier to handle errors in complex workflows.
  • bluebird is a fully-featured Promise library that enhances the native Promise implementation in JavaScript. It provides powerful features for error handling, including catch chaining and error propagation. Bluebird is known for its performance and extensive feature set, making it a popular choice for developers looking to manage asynchronous operations and handle errors effectively.
  • folktale is a suite of libraries for functional programming in JavaScript. It includes constructs for handling errors, such as the Result type, which is similar to neverthrow. Folktale encourages a functional approach to error handling and provides a rich set of tools for composing and managing asynchronous computations.
  • fp-ts is a library for functional programming in TypeScript. It provides various data types and abstractions, including Either and TaskEither, which are useful for handling errors in a functional style. If you're looking for a comprehensive functional programming library that includes error handling, fp-ts is a great choice.
  • monet is another library that provides functional programming constructs for JavaScript. It includes types like Maybe and Either, which help manage errors and optional values. Monet is designed to facilitate functional programming patterns, making it easier to handle errors in a clean and expressive manner.

To explore how neverthrow compares with these alternatives, check out the comparison: Comparing async vs bluebird vs folktale vs fp-ts vs monet vs neverthrow.

README for async

Async Logo

Github Actions CI status NPM version Coverage Status Join the chat at https://gitter.im/caolan/async jsDelivr Hits

Async is a utility module which provides straight-forward, powerful functions for working with asynchronous JavaScript. Although originally designed for use with Node.js and installable via npm i async, it can also be used directly in the browser. An ESM/MJS version is included in the main async package that should automatically be used with compatible bundlers such as Webpack and Rollup.

A pure ESM version of Async is available as async-es.

For Documentation, visit https://caolan.github.io/async/

For Async v1.5.x documentation, go HERE

// for use with Node-style callbacks...
var async = require("async");

var obj = {dev: "/dev.json", test: "/test.json", prod: "/prod.json"};
var configs = {};

async.forEachOf(obj, (value, key, callback) => {
    fs.readFile(__dirname + value, "utf8", (err, data) => {
        if (err) return callback(err);
        try {
            configs[key] = JSON.parse(data);
        } catch (e) {
            return callback(e);
        }
        callback();
    });
}, err => {
    if (err) console.error(err.message);
    // configs is now a map of JSON data
    doSomethingWith(configs);
});

var async = require("async");

// ...or ES2017 async functions
async.mapLimit(urls, 5, async function(url) {
    const response = await fetch(url)
    return response.body
}, (err, results) => {
    if (err) throw err
    // results is now an array of the response bodies
    console.log(results)
})
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