https://github.com/vasanthk/simple-promise-library

A simple implementation of a promise library
https://github.com/vasanthk/simple-promise-library

Last synced: about 1 year ago
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A simple implementation of a promise library

• Host: GitHub
• URL: https://github.com/vasanthk/simple-promise-library
• Owner: vasanthk
• Created: 2015-07-09T05:17:50.000Z (almost 11 years ago)
• Default Branch: master
• Last Pushed: 2016-02-17T17:09:28.000Z (over 10 years ago)
• Last Synced: 2024-03-15T19:10:04.955Z (over 2 years ago)
• Language: JavaScript
• Size: 5.86 KB
• Stars: 13
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# Simple promise library

A simple implementation of a promise library.

This is from promises explained by Axel Rauschmayer in his article [here](http://www.2ality.com/2014/10/es6-promises-api.html)

Credit for [diagram](http://www.2ality.com/2014/10/es6-promises-api.html) and [demo code](https://github.com/rauschma/demo_promise) goes to him.

### Promise: Stand-alone

![Promise: Stand-alone](http://1.bp.blogspot.com/-YtdGXGH__gk/VDEiTAXcqtI/AAAAAAAAA3s/3IwMMkVJSps/s1600/promise1_simple.jpg)

### Promise: Chaining

![Promise: Chaining](http://2.bp.blogspot.com/-pZ2agjPL54Y/VDEiTUClecI/AAAAAAAAA30/3zAmth5qnrE/s1600/promise2_chaining.jpg)

### Promise: Chaining + Flattened

![Promise: Chaining + Flattened](http://2.bp.blogspot.com/-yuykRwpwHFw/VDEiT1k2s9I/AAAAAAAAA34/AN8IZI5uoGw/s1600/promise3_flattening.jpg)

### Promise: Chaining + Flattened

![Promise: Chaining + Flattened + Exceptions](http://2.bp.blogspot.com/-x6hBT5B_yw4/VDEiULOJwII/AAAAAAAAA4E/aUTml-VNKRk/s1600/promise4_exceptions.jpg)

If we wanted to turn this into an actual promise implementation, we’d still need to implement the [revealing constructor pattern](https://blog.domenic.me/the-revealing-constructor-pattern/):

ES6 promises are not resolved and rejected via methods, but via functions that are handed to the executor, the callback parameter of the constructor.

#### Reference Links: 

https://promisesaplus.com/

http://www.2ality.com/2014/10/es6-promises-api.html

http://www.html5rocks.com/en/tutorials/es6/promises/

https://www.promisejs.org/patterns/

http://www.html5rocks.com/en/tutorials/developertools/async-call-stack/