JavaScript Promise Libraries Comparison
bluebird vs lie vs q vs rsvp vs when
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What's JavaScript Promise Libraries?

JavaScript Promise libraries provide a way to handle asynchronous operations more effectively by allowing developers to write cleaner, more manageable code. They enhance the native Promise implementation by offering additional features such as improved performance, better error handling, and more flexible chaining mechanisms. These libraries are particularly useful in environments where complex asynchronous workflows are common, enabling developers to avoid callback hell and improve code readability.

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bluebird26,361,78920,451-1225 years agoMIT
lie12,728,211743-57 years agoMIT
q10,018,87914,927-116-MIT
rsvp5,116,6743,608-186 years agoMIT
when1,104,3083,438-678 years agoMIT
Feature Comparison: bluebird vs lie vs q vs rsvp vs when

Performance

  • bluebird:

    Bluebird is known for its exceptional performance, often outperforming native Promises in benchmarks. It includes optimizations for common use cases, such as batching and concurrency control, making it suitable for high-load applications.

  • lie:

    Lie is designed to be lightweight and fast, but it may not match the performance of Bluebird in more complex scenarios. It is optimized for simplicity rather than raw speed.

  • q:

    Q provides decent performance but may not be as fast as Bluebird. It focuses on interoperability, which can introduce some overhead in certain situations.

  • rsvp:

    RSVP is generally slower than Bluebird but is still efficient for most use cases. Its simplicity can lead to faster development times at the cost of some performance.

  • when:

    When offers competitive performance, especially in scenarios involving complex asynchronous workflows. Its advanced features can lead to increased overhead, but it is optimized for flexibility.

Feature Set

  • bluebird:

    Bluebird offers a rich feature set, including cancellation, progress tracking, and utility methods for working with arrays and objects. It also provides a robust error handling mechanism and supports async/await syntax seamlessly.

  • lie:

    Lie focuses on providing a minimal feature set that closely follows the native Promise API. It lacks advanced features but is easy to use for basic promise handling.

  • q:

    Q includes a variety of utility functions for managing asynchronous operations, such as all, race, and timeout. It also supports chaining and error handling, making it versatile for many use cases.

  • rsvp:

    RSVP provides a straightforward implementation of promises with basic chaining and error handling. It is suitable for simple applications but lacks advanced features found in other libraries.

  • when:

    When includes advanced combinators and utilities for handling multiple promises, such as all, race, and join. It is designed for complex asynchronous scenarios, making it powerful for intricate workflows.

Error Handling

  • bluebird:

    Bluebird provides advanced error handling capabilities, allowing developers to catch errors at any point in the promise chain. It also supports unhandled rejection tracking, which helps identify issues in asynchronous code.

  • lie:

    Lie follows the native Promise error handling model, which is straightforward but may not provide as much flexibility as Bluebird's approach. It is suitable for basic error handling needs.

  • q:

    Q offers a robust error handling mechanism that allows for chaining and catching errors effectively. It also provides utility functions for managing errors in asynchronous workflows.

  • rsvp:

    RSVP has a simple error handling mechanism, similar to native Promises. It allows for catching errors in the promise chain but lacks the advanced features of Bluebird.

  • when:

    When provides a flexible error handling model, allowing developers to catch and manage errors in complex asynchronous scenarios. It supports chaining and can handle errors gracefully.

Learning Curve

  • bluebird:

    Bluebird has a moderate learning curve due to its extensive feature set. However, its comprehensive documentation and community support make it easier for developers to get started and leverage its capabilities effectively.

  • lie:

    Lie has a very low learning curve, as it closely resembles the native Promise API. Developers familiar with native Promises will find it easy to adopt.

  • q:

    Q has a moderate learning curve, especially for developers who need to understand its utility functions and chaining mechanisms. Its documentation is helpful for new users.

  • rsvp:

    RSVP is straightforward and easy to learn, making it suitable for beginners. Its simplicity allows developers to quickly grasp the basics of promise handling.

  • when:

    When has a steeper learning curve due to its advanced features and combinators. Developers may need to invest time in understanding its API to fully utilize its capabilities.

Community and Support

  • bluebird:

    Bluebird has a large and active community, providing extensive documentation, tutorials, and support. It is widely used in production applications, ensuring a wealth of resources for developers.

  • lie:

    Lie has a smaller community compared to other libraries, which may limit the availability of resources and support. However, its simplicity means that fewer resources are needed for basic usage.

  • q:

    Q has a decent community and support, with a variety of resources available for developers. Its interoperability with other libraries enhances its usability in diverse projects.

  • rsvp:

    RSVP has a supportive community, though it is not as large as Bluebird's. It offers sufficient documentation and examples for developers to get started easily.

  • when:

    When has a growing community and provides good documentation, but it may not have as many resources as more established libraries like Bluebird.

How to Choose: bluebird vs lie vs q vs rsvp vs when
  • bluebird:

    Choose Bluebird if you need a high-performance promise library with extensive features, such as cancellation, progress tracking, and utility functions for working with collections. It is ideal for applications that require complex asynchronous flows and need to optimize performance.

  • lie:

    Choose Lie if you prefer a lightweight promise library that adheres closely to the native Promise specification. It is suitable for projects that need basic promise functionality without additional overhead or features.

  • q:

    Choose Q if you are looking for a promise library that emphasizes interoperability and provides a rich set of utility functions for managing asynchronous workflows. It is beneficial for projects that require compatibility with other libraries and frameworks.

  • rsvp:

    Choose RSVP if you want a promise library that focuses on simplicity and ease of use, particularly in environments where you need a straightforward implementation. It is a good choice for smaller projects or for developers who are new to promises.

  • when:

    Choose When if you need a promise library that offers advanced features like combinators and a flexible API for handling complex asynchronous scenarios. It is suitable for applications that require fine-grained control over promise behavior.

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 q

q is a popular promise library for JavaScript that provides a simple and powerful way to work with asynchronous code. It allows developers to create and manage promises, making it easier to handle asynchronous operations and avoid callback hell. While q offers robust promise management, there are several alternatives in the JavaScript ecosystem that also provide similar functionalities. Here are a few noteworthy alternatives:

  • async is a utility module that provides powerful functions for working with asynchronous JavaScript. It simplifies the process of managing asynchronous operations, providing a variety of control flow patterns such as series, parallel, and waterfall. If you need to handle multiple asynchronous tasks and want a comprehensive toolkit for managing their execution order, async is a solid choice. Its flexibility and extensive set of functions make it suitable for a wide range of scenarios, from simple callbacks to complex workflows.
  • bluebird is another popular promise library that extends the native JavaScript promise functionality. It offers a rich set of features, including advanced error handling, cancellation, and performance optimizations. bluebird is particularly useful for applications that require high-performance promise management and complex asynchronous workflows. If you are looking for a promise library that provides additional features and optimizations over native promises, bluebird is worth considering.
  • p-map is a lightweight promise utility that allows you to map over an array of items and return a promise for each item. It is particularly useful for performing asynchronous operations on arrays while controlling concurrency. If you need to process multiple asynchronous tasks concurrently and want to limit the number of promises running at the same time, p-map provides a simple and effective solution.

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

README for bluebird
Promises/A+ logo

Build Status coverage-98%

Got a question? Join us on stackoverflow, the mailing list or chat on IRC

Introduction

Bluebird is a fully featured promise library with focus on innovative features and performance

See the bluebird website for further documentation, references and instructions. See the API reference here.

For bluebird 2.x documentation and files, see the 2.x tree.

Note

Promises in Node.js 10 are significantly faster than before. Bluebird still includes a lot of features like cancellation, iteration methods and warnings that native promises don't. If you are using Bluebird for performance rather than for those - please consider giving native promises a shot and running the benchmarks yourself.

Questions and issues

The github issue tracker is only for bug reports and feature requests. Anything else, such as questions for help in using the library, should be posted in StackOverflow under tags promise and bluebird.

Thanks

Thanks to BrowserStack for providing us with a free account which lets us support old browsers like IE8.

License

The MIT License (MIT)

Copyright (c) 2013-2019 Petka Antonov

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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