!!! Listings aus dem Artikel "Gordische Welt"
!!! von Sebastian Springer, iX  10/2012, S. 58

!!! Listing 1: package.json

{
  name: backbone,
  description: Give your JS App some Backbone with Models, Views, Collections, and Events.,
  url: http://backbonejs.org, 
  keywords: [util, functional, server, client, browser],
  author: Jeremy Ashkenas <jeremy@documentcloud.org>, 
  contributors: [],
  dependencies : {
    underscore: >=1.3.1
  },
  lib: .,
  main: backbone.js,
  version: 0.9.2
}

!!! Listing 2: Webserver mit Kindprozess

// primeServer.js
require('http').createServer(function (req, res) {
    var startTime = new Date();
    console.log('New request incoming');

    require('child_process').fork('prime.js').on('message', function (data) {
        res.writeHead(200, {'Content-Type': 'text/plain'});
        res.end('The 300000st prime number is: ' + data.prime);

        var timediff = Math.round(((new Date()) - startTime) / 10) / 100;
        console.log('Request answered in ' + timediff + ' sec');
    });

}).listen(1337, '127.0.0.1');
console.log('Server running at http://127.0.0.1:1337');

// prime.js
var i, n = 1, results = 1;
primeLoop: while (results < 300000) {
    n += 1;
    for (i = 2; i <= Math.sqrt(n); i += 1) {
        if (n % i === 0) {
            continue primeLoop;
        }
    }
    results += 1;
}
process.send({'prime': n});


!!! Listing 3: Promise-Beispiel

var promise = Q.fcall(function () {
    if (noError) {
        return 'successful';
    }
    throw new Error('erroneous');
});

promise.then(function (value) {
    console.log('Fulfillment: ', value); 
}, function (reason) {
    console.log('Rejection: ', reason);
});

!!! Listing 4: Promises mit deferred


function queryHelper(query) {
    var deferred = Q.defer();

    connection.query(query, function (err, rows, fields) {
        if (err) {
            deferred.reject(new Error(err));
        } else {
            deferred.resolve(rows);
        }
    });
    return deferred.promise;
}

queryHelper('SELECT * FROM users')
.then(function (txt) {
    console.log(txt);
}, function (err) {
    console.log(err);
});


!!! Listing 5: Promise Chaining

queryHelper('INSERT INTO data (value) VALUES ("hallo welt")')
    .the
n(function (txt) {
        return queryHelper('SELECT * FROM data WHERE id = ' + txt.insertId);
    })
    .then(function (txt) {
        console.log(txt);
    });

!!! Listing 6: Test mit jasmine-node

// src/Calculator.js
module.exports = function () {};
module.exports.prototype.add = function (a, b) {
    return a + b;
};

// spec/Calculator.spec.js
var Calc = require('../src/Calculator.js');
describe("Calculator", function () {
    it ("should add 1 and 1 and return 2", function () {
        var calc = new Calc();
        expect(calc.add(1, 1)).toEqual(2);
    })
});