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Engineering JavaScript Dr Jim Purbrick Async 10th March 2011
Who Am I? Technical Director at Linden Lab Setup Linden Lab Brighton Software Engineer Musician Freelancer Entrepreneur
That’s No Moon... 35,000 CPU Cores Weekly Releases No Downtime 1.5 MLOC 100 Engineers 10 Years Image: jurvetson C++, Python, Perl, PHP, C#...
21st Century JavaScript Image: Google Image: W3C
Module myOrg = (function(myOrg) { var myApp = myOrg.myApp = myOrg.myApp || {}; function myPrivateFunction() { // Do my thing. } myApp.myPublicFunction = function() { return myPrivateFunction(); } return myOrg; }(myOrg || {}));
myOrg = (function(myOrg) { Class var myApp = myOrg.myApp = myOrg.myApp || {}, myClass = myOrg.myApp.myClass = myOrg.myApp.myClass || {}; myClass.create = function() { var that = {}; myPrivateMethod() { } that.myPublicMethod = function() { myPrivateMethod(); }; return that; }; return myOrg; }(myOrg || {}));
Inheritance myOrg = (function(myOrg) { var myApp = myOrg.myApp = myOrg.myApp || {}, mySub = myOrg.myApp.mySub = myOrg.myApp.mySub || {}; mySub.create = function() { var that = myApp.myClass.create(), myClassMyPublicMethod = that.myPublicMethod; that.myPublicMethod = function() { // Do something. return myClassMyPublicMethod(); }; return that; }; return myOrg; }(myOrg || {}));
Dependency Injection myOrg = (function(myOrg) { var myApp = myOrg.myApp = myOrg.myApp || {}, mySub = myOrg.myApp.mySub = myOrg.myApp.mySub || {}; mySub.create = function(params) { var that = params.constructor(), myClassMyPublicMethod = that.myPublicMethod, $ = params.jQuery; that.myPublicMethod = function() { return myClassMyPublicMethod(); }; return that; }; return myOrg; }(myOrg || {}));
Production <script type="text/javascript"> $(window).load(function() { var params, mySubInstance; params = { constructor: myOrg.myClass.create, jQuery: jQuery }; mySubInstance = myOrg.myApp.mySub.create(params); // Do something with mySubClassInstance. }; </script>
Test JsHamcrest.Integration.QUnit(); JsMockito.Integration.QUnit(); test('mySubClass calls super class constructor', function () { var params, mySubInstance; params = { constructor: mockFunction(), jQuery: mockFunction() }; mySubInstance = myOrg.myApp.mySub.create(params); verify(params.constructor, once())(); });
More? 1. http://www.adequatelygood.com/2010/3/ JavaScript-Module-Pattern-In-Depth 2. http://www.crockford.com/ 3. http://oreilly.com/catalog/9780596517748 4. http://docs.jquery.com/Qunit 5. http://jsmockito.org/
Thank You! http://jimpurbrick.com http://18dex.com