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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Software Craftsmanship with JavaScript</title>
<meta name="description" content="A collection of tools, patterns and conventions I recommend for professional JS development.">
<meta name="author" content="Johannes Hoppe">
<link rel="shortcut icon" href="images/favicon.ico" >
<meta property="og:image" content="images/logo.png" />
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<link rel="stylesheet" href="css/reveal.min.css">
<link rel="stylesheet" href="css/theme/yellowJS.css" id="theme">
<link rel="stylesheet" href="css/custom.css">
<!-- For syntax highlighting -->
<link rel="stylesheet" href="lib/css/zenburn.css">
<!--<link href="lib/css/default.css" rel="stylesheet" />-->
<!-- If the query includes 'print-pdf', use the PDF print sheet -->
<script>
document.write( '<link rel="stylesheet" href="css/print/' + ( window.location.search.match( /print-pdf/gi ) ? 'pdf' : 'paper' ) + '.css" type="text/css" media="print">' );
</script>
<!--[if lt IE 9]>
<script src="lib/js/html5shiv.js"></script>
<![endif]-->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<img src="images/logo_big.png" width="75%" />
<h1 class="nowrap hidePrint" style="font-size: 2.5em;">Software Craftsmanship </h1>
<h1 class="nowrap showPrint" style="font-size: 1.8em;">Software Craftsmanship</h1>
<br class="hidePrint" />
<br class="hidePrint" />
<small class="hidePrint">Navigate with <span class="key">Esc</span>, <span class="key">→</span> and <span class="key">↓</span></small>
<h4 class="showPrint"><a style="color:brown" href="http://johanneshoppe.github.com/JsBestPractices/index.craftsmanship.html">bit.ly/jsCraftsmanship<br />Interaktive Version der Präsentation!</a></h4>
</section>
<section data-markdown>
### [JohannesHoppe.de](http://www.johanneshoppe.de/)
<h4 class="showPrint"><a style="color:brown" href="http://johanneshoppe.github.com/JsBestPractices/index.craftsmanship.html">bit.ly/jsCraftsmanship<br />Interaktive Version der Präsentation!</a></h4>
</section>
<section data-markdown>
# Prinzipien
Wissen
Werkzeuge
Wiederholung
</section>
<section>
<section data-markdown>
# Wissen
<small>Know the pitfalls</small>
</section>
<section data-markdown>
## Implied globals
<small>Forgetting var</small>
```javascript contenteditable
var foo = function() {
bar = 1;
};
```
</section>
<section data-markdown>
## Boolean type conversion
<small>To Truthy or to Falsy. That is the *only* question!</small>
```javascript contenteditable
var el = document.getElementById('does_not_exist');
if(el == false) {
alert("shouldn't we see this message?!");
}
```
</section>
<section data-markdown>
## Trailing comma
<small>works on my machine!</small>
```javascript contenteditable
var foo = {
bar: "bar",
baz: "baz",
};
```
</section>
<section data-markdown>
## Return undefined
<small>señor developers wear mustaches</small>
<mustache>{</mustache>
```javascript contenteditable
var foo = function() {
return
{
x : "looks like C# now!"
};
}
```
</section>
<section data-markdown>
## Associative arrays
<small>they don't exist</small>
```javascript contenteditable
var x = [];
x['foo'] = "bar";
```
</section>
<section data-markdown>
## try .. catch .. finally
<small>who cares about the reason?</small>
```javascript contenteditable
var foo = function() {
try {
doCrazyStuff;
} catch (e) {
return false;
}
return true;
};
```
</section>
<!--
<section data-markdown>
## for .. in
<small>use a framework</small>
```javascript contenteditable
var data = {
foo: "oh",
bar: "my"
}
for (var d in data) {
console.log(data[d]);
}
```
</section>
<section data-markdown>
## for .. in
<small>& never touch Object.prototype</small>
```javascript contenteditable
Object.prototype.yetAnotherToString = function() {
return "god";
}
```
</section>
-->
<section data-markdown>
## Hoisting
<small>declare upfront all variables</small>
```javascript contenteditable
var foo = "global";
var bar = function() {
alert(foo);
var foo = "local";
alert(foo);
};
```
</section>
<section data-markdown>
## Eval
<small>... and the job is done</small>
```javascript contenteditable
function poorMansJsonParser(text) {
return eval("(" + text + ")");
}
var text = ' { "hello" : "world" } ';
var json = poorMansJsonParser(text);
```
</section>
<section data-markdown data-state="alert">
## Eval is evil!
<small>Never ever!</small>
```javascript contenteditable
var text = ' function() { alert("hacked!"); })( ';
```
</section>
<section data-markdown>
## Globals
<small>the mother of all antipatterns</small>
```javascript contenteditable
function foo() {
return "bar";
}
console.log(this['foo']());
```
</section>
<section data-markdown>
<small>Every time you clutter the global namespace,
somewhere in the world a helpless kitten dies!</small>
</section>
<!--- *********************************** -->
<section data-markdown>
# Wissen
<small>Pretty Code</small>
</section>
<!--
<section data-markdown>
## Coding conventions
<ol>
<li class="fragment">indentation (4 spaces!)</li>
<li class="fragment">curly braces everywhere</li>
<li class="fragment">semicolons everywhere</li>
<li class="fragment">constructor functions: UpperCamelCase</li>
<li class="fragment">all other: lowerCamelCase</li>
</ol>
</section>
-->
<section data-markdown>
## Globals
<small>reduce, minimize, delete or kill them</small>
```javascript contenteditable
(function() { "wtf?" })();
```
</section>
<section data-markdown>
## The switch-case syndrome
<small>a functional language wants functions!</small>
```javascript contenteditable
switch (something) {
case 1:
doFirst();
break;
case 2:
doSecond();
break;
case 3:
doThird();
break;
}
```
</section>
<section data-markdown>
## Lookup tables
<small>avoid the switch-case syndrome</small>
```javascript contenteditable
var methods = {
1: doFirst,
2: doSecond,
3: doThird
};
if (methods[something]) {
methods[something]();
}
```
</section>
<!--
<section data-markdown>
## Inheritance
<small>favour composition over inheritance (FCoI)</small>
<blockquote>
Because inheritance exposes a subclass to details of its parent's implementation,
it's often said that 'inheritance breaks encapsulation'.
</blockquote>
<small class="miniR">(Gang of Four 1995:19)</small>
</section>
-->
<section data-markdown>
## Revealing Module Pattern
```javascript contenteditable fragment
var myRevealingModule = function () {
var _name = "Johannes";
function greetings() {
console.log("Hello " + _name);
}
function setName(name) {
_name = name;
}
return {
setName: setName,
greetings: greetings
};
}();
```
<small class="mini">[» Documentation](http://addyosmani.com/resources/essentialjsdesignpatterns/book/#revealingmodulepatternjavascript)</small>
</section>
<section data-markdown>
## Modul loaders
<small>use AMD (require.js)</small>
```javascript contenteditable fragment
define('test', ['jquery'], function() {
return {
saySomething : function() { alert("hello!"); }
}
});
require(['test'], function(t) {
t.saySomething();
});
```
</section>
<section data-markdown>
## Events
<small>Publish/Subscribe Pattern</small>
```javascript contenteditable
var $events = $({});
$events.bind('somethingHappens', function() {
alert("Something happened!");
});
$events.trigger('somethingHappens');
```
</section>
</section>
<section>
<section data-markdown>
# Werkzeuge
</section>
<section data-markdown>
* Visual Studio 2010/2012
* [JScript Editor Extensions](http://visualstudiogallery.msdn.microsoft.com/872d27ee-38c7-4a97-98dc-0d8a431cc2ed)
* [Resharper 7.1](http://www.jetbrains.com/resharper/whatsnew/#javascript)
* [JSHint](http://www.jshint.com/platforms/)
* [Chutzpah](http://chutzpah.codeplex.com/)
* [Firebug](https://getfirebug.com/) / F12
</section>
<section data-markdown data-state="jasmine">
![Jasmine](images/jasmine_logo.png")
_TDD with [Jasmine](http://pivotal.github.com/jasmine/)_
</section>
<section data-markdown data-state="jasmine">
## Why Jasmine?
<ul class="model jasmine">
<li class="fragment">
<span> BDD-style </span>
<small>similar to JSpec or RSpec,<br>created by authors of jsUnit and Screw.Unit</small>
</li>
<li class="fragment">
<span> independent </span>
<small>from any browser, DOM,<br>framework or host language</small>
</li>
<li class="fragment">
<span> integrates </span>
<small>into continuous build systems</small>
</li>
</ul>
</section>
<section data-markdown data-state="jasmine">
## Jasmine Bootstrap
```html contenteditable small
_LT_!DOCTYPE html_GT_
_LT_html_GT_
_LT_head_GT_
_LT_title_GT_Jasmine Spec Runner_LT_/title_GT_
_LT_link rel=_QUOT_stylesheet_QUOT_ href=_QUOT_lib/jasmine-1.3.1/jasmine.css_QUOT_ /_GT_
_LT_script src=_QUOT_lib/jasmine-1.3.1/jasmine.js_QUOT__GT__LT_/script_GT_
_LT_script src=_QUOT_lib/jasmine-1.3.1/jasmine-html.js_QUOT__GT__LT_/script_GT_
_LT_!-- include source files here... --_GT_
_LT_script src=_QUOT_src/Player.js_QUOT__GT__LT_/script_GT_
_LT_script src=_QUOT_src/Song.js_QUOT__GT__LT_/script_GT_
_LT_!-- include spec files here... --_GT_
_LT_script src=_QUOT_spec/SpecHelper.js_QUOT__GT__LT_/script_GT_
_LT_script src=_QUOT_spec/PlayerSpec.js_QUOT__GT__LT_/script_GT_
_LT_script_GT_
(function () {
var htmlReporter = new jasmine.HtmlReporter();
var jasmineEnv = jasmine.getEnv();
jasmineEnv.addReporter(htmlReporter);
jasmineEnv.specFilter = function (spec) {
return htmlReporter.specFilter(spec);
};
var currentWindowOnload = window.onload;
window.onload = function () {
if (currentWindowOnload) { currentWindowOnload(); }
jasmineEnv.execute();
};
})();
_LT_/script_GT_
_LT_/head_GT_
_LT_body_GT_
_LT_/body_GT_
_LT_/html_GT_
```
</section>
<section data-markdown data-state="jasmine">
## Output
<iframe src="js/jasmine/SpecRunner.html" class="spec" scrolling="no"></iframe>
</section>
<section data-markdown data-state="jasmine">
## Hello World
```javascript contenteditable
var helloWorld = function() {
return "Hello World!";
};
describe('helloWorld', function() {
it('says hello', function() {
expect(helloWorld()).toEqual("Hello World!");
});
});
jasmine.getEnv().execute();
```
<small class="miniR">hint: press F12 and paste this code!</small>
</section>
<!--
<section data-markdown>
## Matchers
```javascript contenteditable
expect(x).toEqual(y);
expect(x).toBe(y);
expect(x).toMatch(pattern);
expect(x).toBeDefined();
expect(x).toBeUndefined();
expect(x).toBeNull();
expect(x).toBeTruthy();
expect(x).toBeFalsy();
expect(x).toContain(y);
expect(x).toBeLessThan(y);
expect(x).toBeGreaterThan(y);
expect(function(){fn();}).toThrow(e);
```
</section>
<section data-markdown>
## Own matchers
```javascript contenteditable
beforeEach(function () {
this.addMatchers({
isACat: function () {
return this.actual.isFluffy() _AMP__AMP_ this.actual.isLazy();
}
});
});
describe('Garfield', function () {
it('is a cat', function () {
expect(new Garfield()).isACat();
});
});
```
<small class="mini">[» Documentation](https://github.com/pivotal/jasmine/wiki/Matchers)</small>
</section>
/////////////////// - TDD example moved to KATA
<section data-markdown>
## Testing HTML
Jasmine is DOM agnostic
comes without tools to set up HTML fixtures
<br><br>
<small class="miniR">Definition:
A test fixture is a fixed state of a set of
objects used as a baseline for running tests.</small>
</section>
<section data-markdown>
## First Solution
<small>in memory fixture with jQuery</small>
```javascript contenteditable
describe('trivial jQuery plugin', function () {
var fixture;
beforeEach(function () {
fixture = $('_LT_div_GT_some HTML code here_LT_/div_GT_');
});
it('should do something', function () {
fixture.myPlugin();
expect(fixture).toHaveClass("newClass");
});
});
jasmine.getEnv().execute();
```
<small>... only works for trivial plugins!</small>
</section>
<section data-markdown>
## Clumsy Solution
<small>directly append to/remove from DOM</small>
```javascript contenteditable
describe('my jQuery plugin', function () {
beforeEach(function () {
$('#fixture').remove();
$('body').append('_LT_div id=_QUOT_fixture_QUOT__GT_HTML_LT_/div_GT_');
});
it('should do something', function () {
$('#fixture').myPlugin();
expect($('#fixture')).toHaveClass("newClass");
});
});
jasmine.getEnv().execute();
```
</section>
<section data-markdown>
## jasmine-jquery
<small>[custom matchers](https://github.com/velesin/jasmine-jquery#jquery-matchers), HTML/style/JSON fixtures, event spies</small>
```javascript contenteditable
describe('my jQuery plugin', function () {
beforeEach(function() {
jasmine.getFixtures().fixturesPath='js/5_jasmine-demo_jquery';
jasmine.getFixtures().load('jquery.myPlugin.spec.html');
});
it('should do something', function() {
var $div = $('#helloWorld').myPlugin();
expect($div).toHaveClass("newClass");
});
});
jasmine.getEnv().execute();
```
<small class="mini"><a href="js/5_jasmine-demo_jquery/SpecRunner.html" target="blank">Demo</a></small>
</section>
<section data-markdown>
## TDD ? BDD
</section>
<section data-markdown>
## Spies
<small>test behaviour</small>
```javascript contenteditable small
describe('Garfield', function () {
describe('when told to be nice', function() {
var garfield;
beforeEach(function() {
garfield = new Garfield();
spyOn(garfield, 'goToFridgeAndEatPizza').andCallThrough();
});
it('should answer with ok', function() {
var answer = garfield.beNice();
expect(answer).toEqual("ok");
});
it('should steal pizza', function () {
garfield.beNice();
expect(garfield.goToFridgeAndEatPizza).toHaveBeenCalled();
});
});
});
jasmine.getEnv().execute();
```
<small class="miniR">A spy can stub any function and tracks calls to it and all arguments.</small>
<small class="mini"><a href="js/6_jasmine-demo_spies/SpecRunner.html" target="blank">Demo</a></small>
</section>
-->
</section>
<section>
<section data-markdown>
# Wiederholung
<br />
# <span title="Kata (Karate)" style="color:#2e2e2c;text-shadow: -1px -1px 0px #101010, 1px 1px 0px #505050;">形</span>
</section>
<section data-markdown>
<blockquote style="width: 500px">
If I would have had time...
</blockquote>
</section>
<section data-markdown>
## You will never have time!
</section>
<section data-markdown>
* __Learn__ TDD
* __Improve__ by self reflection
* __Improve__ by feedback of others
* __Help__ others to improve
* __Teach__ TDD
* __Learn__ a new language
</section>
<section data-markdown>
## Test-Driven Development
1. Write your tests
1. Watch them fail
1. Make them pass
1. Refactor
1. Repeat
<br><br>
<small class="mini">
see [Growing Object-Oriented Software, Guided by Tests](http://www.amazon.de/dp/0321503627), page 6<br>
see [Working Effectively with Legacy Code](http://www.amazon.de/dp/0131177052), page 62 or many other</small>
</section>
<section data-markdown>
## 1. Write your test
```javascript contenteditable
describe("saveFormat", function () {
var original = '{0} - {1} - {2}';
it("should replace placeholders", function () {
var expected = 'A - B - C';
var formated = saveFormat(original, 'A', 'B', 'C');
expect(formated).toEqual(expected);
});
it("should encode injected content", function () {
var expected = 'A - _AMP_lt;b_AMP_gt;TEST_AMP_lt;/b_AMP_gt; - C';
var formated = saveFormat(original, 'A', '_LT_b_GT_TEST_LT_/b_GT_', 'C');
expect(formated).toEqual(expected);
});
});
```
</section>
<section data-markdown>
## 2. Watch them fail
```javascript contenteditable
var saveFormat = function() {
return "boo!";
};
jasmine.getEnv().execute();
```
<small class="mini"><a href="js/1_jasmine-demo_fail/SpecRunner.html" target="blank">Demo</a></small>
</section>
<section data-markdown>
## 3. Make them pass
```javascript contenteditable
var saveFormat = function(txt) {
$(arguments).each(function (i, item) {
if (i _GT_ 0) {
item = ($('_LT_div/_GT_').text(item).html());
txt = txt.replace("{" + (i - 1) + "}", item);
}
});
return txt;
};
jasmine.getEnv().execute();
```
<small class="mini"><a href="js/2_jasmine-demo_pass/SpecRunner.html" target="blank">Demo</a></small>
</section>
<section data-markdown>
## 4. Refactor
```javascript contenteditable
function htmlEncode(input) {
return ($('_LT_div/_GT_').text(input).html());
}
var saveFormat = function(txt) {
$.each(arguments, function (i, item) {
if (i _GT_ 0) {
item = htmlEncode(item);
txt = txt.replace("{" + (i - 1) + "}", item);
}
});
return txt;
};
jasmine.getEnv().execute();
```
<small class="mini"><a href="js/3_jasmine-demo_refactor/SpecRunner.html" target="blank">Demo</a></small>
</section>
<section data-markdown>
## 5. Repeat
```javascript contenteditable
function htmlEncode(input) {
return ($('_LT_div/_GT_').text(input).html());
}
var saveFormat = function() {
var args = Array.prototype.slice.call(arguments);
var txt = args.shift();
$.each(args, function (i, item) {
item = htmlEncode(item);
txt = txt.replace("{" + i + "}", item);
});
return txt;
};
jasmine.getEnv().execute();
```
<small class="mini"><a href="js/4_jasmine-demo_repeat/SpecRunner.html" target="blank">Demo</a></small>
</section>
<section data-markdown>
## Deep practice
<br />
<small>
[codekata.pragprog.com](http://codekata.pragprog.com)
[katas.softwarecraftsmanship.org](http://katas.softwarecraftsmanship.org/)
</small>
</section>
</section>
<section data-markdown>
# Danke!
[blog.johanneshoppe.de](http://blog.johanneshoppe.de/2013/06/dwx-developer-week/)
</section>
</div>
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Created by <a href="http://johanneshoppe.de" target="_blank">Johannes Hoppe</a>
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<span class="hidePrint">| <a href="https://github.com/JohannesHoppe/JsBestPractices" target="_blank">GitHub</a></span>
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