This article has been given a more permanent home on my blog. Also, since it was first written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.
Promises are a software abstraction that makes working with asynchronous operations much more pleasant. In the most basic definition, your code will move from continuation-passing style:
getTweetsFor("domenic", function (err, results) {
// the rest of your code goes here.
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| // === Arrays | |
| var [a, b] = [1, 2]; | |
| console.log(a, b); | |
| //=> 1 2 | |
| // Use from functions, only select from pattern | |
| var foo = () => [1, 2, 3]; |
| # -*- coding: utf-8 -*- | |
| import re | |
| import urllib | |
| from multiprocessing import Pool | |
| import requests | |
| import progressbar | |
| CHUNK_SIZE = 1024 * 1024 # 1MB | |
| def download(i): |
| """ | |
| Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy) | |
| BSD License | |
| """ | |
| import numpy as np | |
| # data I/O | |
| data = open('input.txt', 'r').read() # should be simple plain text file | |
| chars = list(set(data)) | |
| data_size, vocab_size = len(data), len(chars) |
| var getPosition = function (options) { | |
| return new Promise(function (resolve, reject) { | |
| navigator.geolocation.getCurrentPosition(resolve, reject, options); | |
| }); | |
| } | |
| getPosition() | |
| .then((position) => { | |
| console.log(position); | |
| }) |
