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A curated list of useful resources for JavaScript Promises

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[ Daily / Weekly / Overview ]

Nov 14 - Nov 20, 2016

Resources, Blogs, and Books / For beginners

• JavaScript Promises: an Introduction - Basics of JavaScript's native promise implementation.

• Promise it won't hurt (⭐718) - An interactive nodeschool workshop

• An Incremental Tutorial on Promises - An FAQ styled tutorial for beginners.

Resources, Blogs, and Books / Deep Dive

• Promise Fun (⭐4.1k) - @sindresorhus's notes, patterns, and solutions to common Promise problems

• Async functions - making promises friendly

Promises/A+ Implementations (ES6/ES2015 compatible) / Implementations with extras

• creed (⭐270) - Hyper performant & full featured like Bluebird, but FP-oriented. Coroutines, generators, promises, ES2015 iterables, & fantasy-land spec.

Convenience Utilities / sindresorhus's many Promise utilities ( see notes )

• delay (⭐516) - Delay a promise a specified amount of time.

• loud-rejection (⭐282) - Make unhandled promise rejections fail loudly instead of the default silent fail.

• hard-rejection (⭐102) - Make unhandled promise rejections fail hard right away instead of the default silent fail

• p-queue (⭐2.3k) - Promise queue with concurrency control

• p-break (⭐19) - Break out of a promise chain

• p-lazy (⭐247) - Create a lazy promise that defers execution until .then() or .catch() is called

• p-defer (⭐58) - Create a deferred promise

• p-if (⭐62) - Conditional promise chains

• p-tap (⭐132) - Tap into a promise chain without affecting its value or state

• p-map (⭐910) - Map over promises concurrently

• p-all (⭐212) - Run promise-returning & async functions concurrently with optional limited concurrency

• p-limit (⭐1.1k) - Run multiple promise-returning & async functions with limited concurrency

• p-times (⭐35) - Run promise-returning & async functions a specific number of times concurrently

• p-catch-if (⭐38) - Conditional promise catch handler

• p-time (⭐65) - Measure the time a promise takes to resolve

• p-log (⭐25) - Log the value/error of a promise

• p-filter (⭐62) - Filter promises concurrently

• p-settle (⭐81) - Settle promises concurrently and get their fulfillment value or rejection reason

• p-memoize (⭐312) - Memoize promise-returning & async functions

• p-whilst (⭐45) - Calls a function repeatedly while a condition returns true and then resolves the promise

• p-throttle (⭐289) - Throttle promise-returning & async functions

• p-debounce (⭐152) - Debounce promise-returning & async functions

• p-retry (⭐569) - Retry a promise-returning or async function

• p-wait-for (⭐121) - Wait for a condition to be true

• p-timeout (⭐205) - Timeout a promise after a specified amount of time

• p-race (⭐36) - A better Promise.race()

• p-try (⭐42) - Promise#try() ponyfill - Starts a promise chain

• p-finally (⭐47) - Promise#finally() ponyfill - Invoked when the promise is settled regardless of outcome

• p-any (⭐53) - Wait for any promise to be fulfilled

• p-some (⭐34) - Wait for a specified number of promises to be fulfilled

• p-pipe (⭐109) - Compose promise-returning & async functions into a reusable pipeline

• p-each-series (⭐46) - Iterate over promises serially

• p-map-series (⭐44) - Map over promises serially

• p-reduce (⭐64) - Reduce a list of values using promises into a promise for a value

• p-props (⭐168) - Like Promise.all() but for Map and Object

Convenience Utilities / Others

• promise-nodeify (⭐1) - Standalone nodeify method which calls a Node-style callback on resolution or rejection.

Mar 28 - Apr 03, 2016

Resources, Blogs, and Books / Deep Dive

• We have a problem with promises - "Many of us are using promises without really understanding them."

Promises/A+ Implementations (ES6/ES2015 compatible) / Strict Implementations

• es6-promise (⭐7.3k) - Opt-in polyfill. A strict-spec subset of rsvp.js.

Convenience Utilities / Others

• promise-semaphore (⭐29) - Push a set of work to be done in a configurable serial fashion

Jan 18 - Jan 24, 2016

Convenience Utilities / Others

• promise-do-whilst (⭐3) - Calls a function repeatedly while a condition returns true and then resolves the promise.

Jan 11 - Jan 17, 2016

Resources, Blogs, and Books / For beginners

• ES6 Promises in Depth

Jan 04 - Jan 10, 2016

Resources, Blogs, and Books / References

• Promisees - Promise visualization playground for the adventurous.

Nov 30 - Dec 06, 2015

Convenience Utilities / Others

• promise-do-until (⭐1) - Calls a function repeatedly until a condition returns true and then resolves the promise.

Oct 12 - Oct 18, 2015

Resources, Blogs, and Books / For beginners

• ES6 Kata Promises - Promises Katas : Basics

Resources, Blogs, and Books / Deep Dive

• Promise anti-patterns (2) - Another set of promises anti-patterns

• Javascript Promises...In Wicked Detail - Recreate the promise implementation

• Writing Promise-Using Specifications - "This document gives guidance on how to write specifications that create, accept, or manipulate promises"

Resources, Blogs, and Books / References

• Promises/A+ specification

Oct 05 - Oct 11, 2015

Resources, Blogs, and Books / Deep Dive

• You're Missing the Point of Promises - Promises are much more than callback aggregation, and that jQuery's implementation (prior to 3.0) isn't enough.

• Promise anti-patterns (⭐20k) - Common misuses and how to avoid them.

• Promise Ponderings, (Anti-)Patterns, and Apologies - Promise behaviour demonstrated and explained by common questions and their answers.

Resources, Blogs, and Books / References

• caniuse promises

• Fates and States (⭐1.2k) - Quick definitions of possible states.

Sep 28 - Oct 04, 2015

Resources, Blogs, and Books / For beginners

• Promise Cookbook (⭐1.6k) - The why, what, and how. "A brief introduction [...] primarily aimed at frontend developers".

• Promises for Asynchronous Programming - Chapter from Exploring ES6

• You Don't Know JS: Promises (⭐160k) - Chapter from You Don't Know JS: Async & Performance (⭐160k)

• JavaScript with Promises - from O'Reilly. Short and to-the-point. Uses native and bluebird.

Promises/A+ Implementations (ES6/ES2015 compatible) / Strict Implementations

• pinkie (⭐138) - Ponyfill. Node-oriented, but browserifyable (⭐14k). Extremely small implementation.

• native-promise-only (⭐719) - Polyfill. Browser and node-compatible.

• lie (⭐744) - Small, browserifyable with an opt-in polyfill.

Sep 21 - Sep 27, 2015

Promises/A+ Implementations (ES6/ES2015 compatible) / Implementations with extras

• bluebird (⭐20k) - Fully featured, extremely performant. Long stack traces & generator/coroutine support.

• rsvp.js (⭐3.6k) - Lightweight with a few extras. Compatible down to IE6!

• Q (⭐15k) - One of the original implementations. Long stack traces and other goodies.

• then/promise (⭐2.5k) - Small with nodeify, denodify and done() additions.

• when.js (⭐3.4k) - Packed with control flow, functional, and utility methods.

Promises/A+ Implementations (ES6/ES2015 compatible) / Fallbacks

• native-or-bluebird - Helps transition to completely native.

• pinkie-promise (⭐120) - Use native, or fall back to pinkie. Great for node library authors.

• any-promise (⭐179) - Loads the first available implementation. Safe for browserify.

Convenience Utilities / sindresorhus's many Promise utilities ( see notes )

• pify (⭐1.5k) - Promisify ("denodify") a callback-style function.

Convenience Utilities / Others

• promise-method (⭐2) - Standalone bluebird.method. Turn a synchronously-returning method into a promise-returning one.

• is-promise (⭐275) - Determine if something looks like a Promise.

• sprom (⭐14) - Resolve when a stream ends. Optional buffering (be careful with this!)

• task.js (⭐1.6k) - Write async functions in a blocking style using promises and generators. Like bluebird.coroutine.

• co (⭐12k) - Like task.js and bluebird.coroutine, but supports thunks too.

• lie-fs - Promise wrappers for Node's FS API.