Node.js for mobile developers

Quick and dirty Node.js overview given to the mobile team at Tumblr on 4/30/2014. This doesn't have anything to do with mobile per se, but centers on why developers who rarely have time to do web development would be well suited to pick up Node.js for the times that they do.

These slides were creating using Deckset (http://www.decksetapp.com), and the source can be found here: https://gist.github.com/irace/ec0ce0faaadf00ccaddb

Transcript

1. Node.js for mobile developers Bryan Irace
2. What is Node.js? A platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.
3. Not a web framework or language
4. Components 4 V8 (Google's JavaScript engine) 4 libuv (platform Independent I/O bindings) 4 Core libraries (networking, modules, REPL, streams, logging) 4 OpenSSL, etc.
5. What's it good at? 4 I/O 4 Command line tools 4 Not CPU-bound work
6. Everything is asynchronous
7. JavaScript 4 Easy to learn 4 Powerful 4 Runs everywhere (you need to know it anyway...) 4 Always getting faster 4 Improving pretty rapidly 4 Lots of good libraries
8. NPM ~70K modules
9. package.json { "name": "lunchr", "version": "1.0.0", "dependencies": { "express": "3.4.3", "request": "2.27.0", "underscore": "1.6.0" } }
10. Importing var request = require('request'); var _ = require('underscore'); var qs = require('querystring'); var express = require('express');
11. Modules 4 jQuery 4 Underscore 4 Express 4 Async 4 Request
12. Express var express = require('express'); var app = express(); app.get('/', function(req, res){ res.send('Hello, world'); }); app.listen(3000);
13. Async async.parallel([ function (callback) { ywa('1519698779', 'BOOKMARK_10135', callback); }, function (callback) { play('com.tumblr', callback); } ], function (err, results) { if (err) { callback(err); } else { var ywa_data = results[0] , play_rating = results[1] // TODO } }
14. Request request({ url: 'https://rink.hockeyapp.net/api/2/apps/' + app_id + '/statistics', headers: { 'X-HockeyAppToken': '61c40d6b6fac43d880e97c0bd22b4903' } }, function (err, response, body) { if (err) { callback(err); } else { var versions = JSON.parse(body)['app_versions']; // TODO } }
15. jQuery $('tr.stathead').remove(); $('tr').removeAttr('align').removeAttr('class'); $('tr:first').find('td').replaceWith(function () { return $('<th></th>') .html($(this).contents()) .attr('data-week', index_of($(this))); });
16. Underscore _.chain([1, 2, 3, 200]) .filter(function(num) { return num % 2 == 0; }) .map(function(num) { return num * num }) .value();
17. shell.js require('shelljs/global'); if (!which('git')) { echo('Sorry, this script requires git'); exit(1); } // Copy files to release dir mkdir('-p', 'out/Release'); cp('-R', 'stuff/*', 'out/Release'); // Replace macros in each .js file cd('lib'); ls('*.js').forEach(function(file) { sed('-i', 'BUILD_VERSION', 'v0.1.2', file); sed('-i', /.*REMOVE_THIS_LINE.*\n/, '', file); sed('-i', /.*REPLACE_LINE_WITH_MACRO.*\n/, cat('macro.js'), file); }); cd('..'); // Run external tool synchronously if (exec('git commit -am "Auto-commit"').code !== 0) { echo('Error: Git commit failed'); exit(1); }
18. Hosting 4 Easy to install 4 Windows 4 OS X (just a .dmg file) 4 Easy to host 4 Heroku 4 Windows Azure
19. Debugging 4 node-inspector