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julianduquejulianduque
committedMar 1, 2013
Examples
0 parents  commit 88952c2

16 files changed

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Diff for: ‎.gitignore

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node_modules

Diff for: ‎01.js

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//
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// Understanding Async Nature
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//
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function insert(id, callback) {
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setTimeout(function() {
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console.log('Insertando ' + id);
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callback('Exitoso');
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}, 3000);
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}
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console.log('Op1');
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insert(1, function(result) {
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console.log(result);
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});
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console.log('Op2');

Diff for: ‎02.js

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//
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// 02 - Pyramid of Doom / Callback Hell/Soup
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//
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console.log('Inicio');
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step1(function(result1) {
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step2(function(result2) {
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step3(function(result3) {
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step4(function(result4) {
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console.log('Result is: '+ result4);
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});
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});
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});
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});
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console.log('Fin');
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function step1(callback) {
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setTimeout(function () {
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console.log('Hello step 1');
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callback(1);
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}, (Math.random() * 1000));
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}
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function step2(callback) {
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setTimeout(function () {
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console.log('Hello step 2');
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callback(2);
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}, (Math.random() * 1000));
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}
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function step3(callback) {
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setTimeout(function () {
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console.log('Hello step 3');
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callback(3);
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}, (Math.random() * 1000));
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}
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function step4(callback) {
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setTimeout(function () {
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console.log('Hello step 4');
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callback(4);
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}, (Math.random() * 1000));
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}

Diff for: ‎03.js

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//
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// 03 - Common Problems
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//
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function checkPassword(username, passwordGuess, callback) {
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var queryStr = 'SELECT * FROM user WHERE username = ?';
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db.query(selectUser, username, function (err, result) {
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if (err) throw err;
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hash(passwordGuess, function(passwordGuessHash) {
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callback(passwordGuessHash === result.password_hash);
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});
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});
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}
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function checkPassword(username, passwordGuess, callback) {
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var passwordHash;
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var queryStr = 'SELECT * FROM user WHERE username = ?';
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db.query(selectUser, username, queryCallback);
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function queryCallback(err, result) {
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if (err) throw err;
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passwordHash = result.password_hash;
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hash(passwordGuess, hashCallback);
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}
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function hashCallback(passwordGuessHash) {
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callback(passwordHash === passwordGuessHash);
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}
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}

Diff for: ‎04.js

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//
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// PubSub
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//
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var EE = new require('events').EventEmitter;
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var emitter = new EE();
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(function() {
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setTimeout(function() {
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emitter.emit('action', 'Hello Med.js');
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}, 5000);
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})(); // Remember IIFE
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emitter.on('action', function (params) {
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console.log(params);
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});
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emitter.on('action', function (params) {
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console.log('I can execute more actions!!');
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});
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// jQuery http://jsfiddle.net/jcsdD/

Diff for: ‎05-server.js

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var http = require('http'),
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fs = require('fs');
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http.createServer(function (req, res) {
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res.writeHead(200, { 'Content-Type': 'text/html'});
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switch (req.url) {
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case '/step1':
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res.write(JSON.stringify({ step: 1 }));
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res.end();
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break;
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case '/step2':
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res.write(JSON.stringify({ step: 2 }));
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res.end();
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break;
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default:
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fs.readFile(__dirname + '/05.html', 'utf-8', function (err, file) {
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if (err) throw err;
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res.write(file);
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res.end();
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});
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}
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}).listen(8080);
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console.log('Running');

Diff for: ‎05.html

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<!doctype html>
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<html>
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<head>
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<meta charset='utf-8' />
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<title>Demo</title>
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<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
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<script>
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$.ajax({
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method: 'get',
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url: 'http://localhost:8080/step1',
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success: successHandler,
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error: failHandler
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});
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$.get('http://localhost:8081/step1').
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done(successHandler).
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fail(failHandler);
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function successHandler(response) {
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console.log(response);
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}
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function failHandler(response) {
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console.log(response);
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}
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</script>
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</head>
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<body>
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<p>Hello this is demo, see the debug console!</p>
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</body>
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</html>

Diff for: ‎05.js

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//
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// Promises
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//
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var Q = require('q'),
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fs = require('fs');
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readFile('05.js').
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then(fileHandler).
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fail(failHandler);
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function readFile(filename) {
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var fileReading = Q.defer();
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fs.readFile(filename, 'utf-8',
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fileReading.makeNodeResolver());
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return fileReading.promise;
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}
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function failHandler (err) {
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console.error(err);
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}
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function fileHandler(file) {
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console.log(file);
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}

Diff for: ‎06.js

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//
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// Async.js
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//
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function insert(id, callback) {
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setTimeout(function() {
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console.log('Inserting ' + id);
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callback();
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}, (Math.random() * 1000));
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}
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for(var i = 0; i < 10; i++) {
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insert(i, function() {
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console.log('Im done with' + i);
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});
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}

Diff for: ‎07.js

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var fs = require('fs');
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var concatenation = '';
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fs.readdirSync('.')
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.filter(function(filename) {
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// ignore directories
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return fs.statSync(filename).isFile();
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}).forEach(function(filename) {
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// add contents to our output
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concatenation += fs.readFileSync(filename, 'utf8');
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});
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console.log(concatenation);

Diff for: ‎07a.js

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var fs = require('fs');
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var concatenation = '';
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fs.readdir('.', function(err, filenames) {
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if (err) throw err;
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function readFileAt(i) {
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var filename = filenames[i];
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console.log(filename);
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if (typeof filename !== 'undefined') {
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fs.stat(filename, function(err, stats) {
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if (err) throw err;
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if (!stats.isFile()) return readFileAt(i + 1);
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fs.readFile(filename, 'utf8', function(err, text) {
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if (err) throw err;
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concatenation += text;
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if (i + 2 === filenames.length) {
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// all files read, display the output
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return console.log(concatenation);
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}
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readFileAt(i + 1);
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});
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});
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}
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}
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readFileAt(0);
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});

Diff for: ‎07b.js

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var async = require('async');
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var fs = require('fs');
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var concatenation = '';
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var dirContents = fs.readdirSync('.');
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async.filter(dirContents, isFilename, function(filenames) {
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async.eachSeries(filenames, readAndConcat, onComplete);
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});
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function isFilename(filename, callback) {
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fs.stat(filename, function(err, stats) {
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if (err) throw err;
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callback(stats.isFile());
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});
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}
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function readAndConcat(filename, callback) {
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fs.readFile(filename, 'utf8', function(err, fileContents) {
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if (err) return callback(err);
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concatenation += fileContents;
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callback();
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});
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}
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function onComplete(err) {
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if (err) throw err;
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console.log(concatenation);
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}

Diff for: ‎08.js

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//
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// Async.js
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//
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var async = require('async');
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function insert(id, callback) {
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setTimeout(function() {
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console.log('Inserting ' + id);
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callback(null, id);
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}, (Math.random() * 1000));
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}
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function filter(data, callback) {
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callback(data < 3);
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}
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var data = [0, 1, 2, 3, 4, 5];
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async.filter(data, filter, function(filteredData) {
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async.eachSeries(filteredData, insert, function(err) {
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if (err) throw err;
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console.log('Finished');
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});
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});
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/*async.each(data, insert, function(err) {
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if (err) throw err;
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console.log('Finished');
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});*/
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Diff for: ‎09.js

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var async = require ('async');
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var start = new Date();
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async.parallel([
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function(callback) { setTimeout(callback, 100); },
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function(callback) { setTimeout(callback, 300); },
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function(callback) { setTimeout(callback, 200); }
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], function(err, results) {
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// show time elapsed since start
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console.log('Completed in ' + (new Date() - start) + 'ms');
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});

Diff for: ‎09a.js

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//
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// 02 - Pyramid of Doom / Callback Hell/Soup
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//
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var async = require('async');
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async.parallel([
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function(callback) {
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console.log('Inicio');
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callback(null, 0);
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},
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step1,
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step2,
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step3,
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step4
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], function(err, results) {
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console.log('Result is: ' + results);
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console.log('Fin');
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});
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function step1(callback) {
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setTimeout(function () {
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console.log('Hello step 1');
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callback(null, 'Hola');
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}, (Math.random() * 1000));
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}
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function step2(callback) {
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setTimeout(function () {
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console.log('Hello step 2');
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callback(null, 'Mundo');
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}, (Math.random() * 1000));
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}
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function step3(callback) {
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setTimeout(function () {
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console.log('Hello step 3');
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callback(null, 'Soy Async');
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}, (Math.random() * 1000));
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}
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function step4(callback) {
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setTimeout(function () {
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console.log('Hello step 4');
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callback(null, 4);
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}, (Math.random() * 1000));
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}

Diff for: ‎09b.js

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//
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// 02 - Pyramid of Doom / Callback Hell/Soup
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//
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var async = require('async');
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async.waterfall([
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function(callback) {
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console.log('Inicio');
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callback(null, 0);
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},
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step1,
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step2,
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step3,
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step4
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], function(err, results) {
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console.log('Result is: ' + results);
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console.log('Fin');
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});
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function step1(number, callback) {
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setTimeout(function () {
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console.log('Hello step 1');
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callback(null, 1);
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}, (Math.random() * 1000));
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}
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function step2(number, callback) {
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setTimeout(function () {
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console.log('Hello step 2');
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callback(null, 2);
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}, (Math.random() * 1000));
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}
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function step3(number, callback) {
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setTimeout(function () {
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console.log('Hello step 3');
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callback(null, 3);
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}, (Math.random() * 1000));
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}
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function step4(number, callback) {
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setTimeout(function () {
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console.log('Hello step 4');
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callback(null, 'Resultado final');
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}, (Math.random() * 1000));
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}

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