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written, the development of the Promises/A+ specification has made the original emphasis on Promises/A seem somewhat outdated.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.
| #!/usr/bin/env python | |
| import ctypes | |
| import wave | |
| import sys | |
| pa = ctypes.cdll.LoadLibrary('libpulse-simple.so.0') | |
| PA_STREAM_PLAYBACK = 1 | |
| PA_SAMPLE_S16LE = 3 |
Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.
$ python -m SimpleHTTPServer 8000
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| #include <stdio.h> | |
| #include <stdlib.h> | |
| #include <unistd.h> | |
| #include <errno.h> | |
| #include <string.h> | |
| #include <fcntl.h> | |
| #include <signal.h> | |
| #include <sys/types.h> | |
| #include <sys/socket.h> | |
| #include <netinet/in.h> |
| #!/usr/bin/env python | |
| """Use inotify to watch a directory and execute a command on file change. | |
| Watch for any file change below current directory (using inotify via pyinotify) | |
| and execute the given command on file change. | |
| Just using inotify-tools `while inotifywait -r -e close_write .; do something; done` | |
| has many issues which are fixed by this tools: | |
| * If your editor creates a backup before writing the file, it'll trigger multiple times. | |
| * If your directory structure is deep, it'll have to reinitialize inotify after each change. |
The final result: require() any module on npm in your browser console with browserify
This article is written to explain how the above gif works in the chrome (and other) browser consoles. A quick disclaimer: this whole thing is a huge hack, it shouldn't be used for anything seriously, and there are probably much better ways of accomplishing the same.
Update: There are much better ways of accomplishing the same, and the script has been updated to use a much simpler method pulling directly from browserify-cdn. See this thread for details: mathisonian/requirify#5
| var mediaJSON = { "categories" : [ { "name" : "Movies", | |
| "videos" : [ | |
| { "description" : "Big Buck Bunny tells the story of a giant rabbit with a heart bigger than himself. When one sunny day three rodents rudely harass him, something snaps... and the rabbit ain't no bunny anymore! In the typical cartoon tradition he prepares the nasty rodents a comical revenge.\n\nLicensed under the Creative Commons Attribution license\nhttp://www.bigbuckbunny.org", | |
| "sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/BigBuckBunny.mp4" ], | |
| "subtitle" : "By Blender Foundation", | |
| "thumb" : "images/BigBuckBunny.jpg", | |
| "title" : "Big Buck Bunny" | |
| }, | |
| { "description" : "The first Blender Open Movie from 2006", | |
| "sources" : [ "http://commondatastorage.googleapis.com/gtv-videos-bucket/sample/ElephantsDream.mp4" ], |
This code implements a naive JSON writer in C++ complying with RFC 4627. I wrote this as I believe it is a very good example of a real life problem involving lots of C++ constructs. This sample only supports writing JSON and does not support heterogenous ‘object’ serialization and extension are left as an exercice. See Writing json in C++ for some details.
json_stream: a std::ofstream wrapper fulfilling RFC 4627 constraints;utf8_json: some code to decode/“json encode” std::string UTF-8 buffersjson_test.cpp: a very simple program testing the code
| <!-- MIT License --> | |
| <html> | |
| <head> | |
| <script> | |
| function generateKey(alg, scope) { | |
| return new Promise(function(resolve) { | |
| var genkey = crypto.subtle.generateKey(alg, true, scope) | |
| genkey.then(function (pair) { | |
| resolve(pair) | |
| }) |