YOOX Launch & Learn - Javascript as a programming language

Javascript As AProgramming Language

IS Javascript As AProgramming LanguageVersioning, Test Driven Development & Continuous Integration

Hello, who’s speaking?

Hello, who’s speaking? Marco Cedaro @cedmax

Hello, who’s speaking? Marco Cedaro @cedmax They said I am a... Frontend Cowboy Nicola Vitto

Hello, who’s speaking? Marco Cedaro @cedmax They said I am a... Frontend Cowboy Nicola Vitto Javascript Pervert Roberto Felter

Hello, who’s speaking? Marco Cedaro @cedmax They said I am a... Frontend Cowboy Nicola Vitto Javascript Pervert Roberto Felter Perfect Stranger basically anyone else

Hello, who’s speaking? Marco Cedaro @cedmax Actually I am: still a Platform Software Developer at Yoox Group, currently in charge of js architecture development

Hello, who’s speaking? Marco Cedaro @cedmax Actually I am: still a Platform Software Developer at Yoox Group, currently in charge of js architecture development Frontend Meetup organizer with From The Front

Hello, who’s speaking? Marco Cedaro @cedmax Actually I am: still a Platform Software Developer at Yoox Group, currently in charge of js architecture development Frontend Meetup organizer with From The Front and a javascript pervert

1. Disclaimer 2. You Need a Strategy 3. Continuous Integration4. Choose Your Tools 5. The Environment 6. In The Wild 1. Disclaimer

DISCLAIMERAlways code as if the guy who ends upmaintaining your code will be a violentpsychopath who knows where you live Martin Golding

REAL DISCLAIMERJavascript is not jQuery Let’s say it all together: “Javascript is not jQuery” What do you mean? I mean that Javascript is not just something you ﬁnd online, cut and paste in a <script> just before the end of the </body>

Not jQuery’s faultjQuery is extremely powerfulbut...WITH GREAT POWER THEREMUST ALSO COME - - GREATRESPONSABILITY! ** original sentence from 1962 ﬁrst spiderman story

The right tool in wrong hands but who cares? as long as interaction is held by: designers that aren’t exactly aware of what they are doing backend developers even worse: they mostly don’t even care about what’s happening clientside as long as everything works

Not a “merchant of complexity” we don’t need just to let stuff work we don’t need complexity either we need a strategy to let code be maintainable and reusable

is it about simplicity?it isnt there’s a lot of people who hides their ignorance behind simplicity Front end developers have to claim their role in development roadmap and business strategy, because...

Javascript is a serious business

Whats relyingon javascript?

Whats relyingon javascript? performance ↓ user experience ↓ conversion ↓ money

Whats relyingon javascript? ajax interaction ↓less bandwith & server load ↓ less infractucture costs ↓ money

Whats relyingon javascript? cross platform animation ↓ less tecnologies ↓ less code duplication ↓ money

1. Disclaimer 2. You Need a Strategy 3. Continuous Integration4. Choose Your Tools 5. The Environment 6. In The Wild 2.You Need a Strategy

YOU NEED A STRATEGY Whats the use of running if you are not on the right road German proverb

YOU NEED A STRATEGY Why do you need a strategy? you need a strategy because best practices and design patterns are the same in a 4 guys based company as well as in a large corporate.

It doesn’t really matter if you are working at facebook, soundcloud or by yourself in a small ofﬁce. How many people code?

A real life example Small Web Agency 1 designer, 2 developers and a lot of small website with low maintenance rate.

The designerintroduces a slider on 5 websites:”it’s cool on apple store”.The developer gets a jQuery plugin online a SLIDER’s Story

The designerintroduces a slider on 5 Major release of the websites: most used browser.”it’s cool on apple store”. A small ﬁx has been released, they have to changeThe developer gets a jQuery 5 ﬁles in 5 different projects. plugin online a SLIDER’s Story

The designer Oh damn! There’s nointroduces a slider on 5 Major release of the mouse wheel websites: most used browser. integration!”it’s cool on apple store”. A small ﬁx has been released, they have to change should they ask for supportThe developer gets a jQuery 5 ﬁles in 5 different projects. or should they change the plugin online library by themself? a SLIDER’s Story

Am I the only one orthere’s something wrong?

Just a spoonful of sugar... manage codebase just in one place continue development without regression use stable versions of our libraries

1. Disclaimer 2. You Need a Strategy 3. Continuous Integration4. Choose Your Tools 5. The Environment 6. In The Wild 3. Continuous Integration

Continuous Integration A software development practice where members of a team integrate their work frequently. Each integration is veriﬁed by an automated build to detect integration errors as quickly as possible. Martin Fowler CI is about the fundamentals. If we don’t focus on the fundamentals we’ll be forced to perform low-level tasks later, usually at the most inconvenient times Paul Duvall, Continuous Integration

I Build So Consistently

I Build So Consistentlyidentify

I Build So Consistently buildidentify

I Build So Consistently buildidentify share

I Build So Consistently buildidentify share make it continuous

How does this ﬁt our needs?

codebase just in one place setup an isolated repository for reusable libraries share the code through a CI process resolve dependency on websites

continue development without regressionvalidate the coderun tests against errors (both coding and logic)version the shared code against interface changes

stable versionsuse a declared semantic versioninguse a ﬁle system based pattern: //jsRepo/dist/yourscript-1.0.0/yourscript.js //jsRepo/dist/yourscript-1.0.0.jsnever modify already released versions increase version number instead

Unit & Functional an overview

Unit & Functional an overview is it red? is it a 4x2 block? is the roof red? is it made to ﬁt is there a porch?well other block? is there a door?

Unit vs Functional test consistencytest cross interaction control against execution test browser between over external time integration issues different codebase changes libraries

Test Driven Development

You will, eventually..

Everyone should be happy

an advice Keep it Simple & SmartDon’t over-engineer it: you will eventually regret everysingle useless complexity you will introduce

1. Disclaimer 2. You Need a Strategy 3. Continuous Integration4. Choose Your Tools 5. The Environment 6. In The Wild 4. Choose Your Tools

CHOOSE YOUR TOOLS A man cannot be too careful in the choice of his enemies Oscar Wilde

Another Neat ToolSimply saying the documentation sucks doesnt do any good Larry V. Streepy - Ant Mailing List 06.06.2001

Another Neat ToolSimply saying the documentation sucks doesnt do any good Larry V. Streepy - Ant Mailing List 06.06.2001He was right: 10 years later ANT documentation still sucks but ANT is a solidchoice in build automation conﬁguration.

ANTXML driven: simple and straightforwarda standardthere are a lot of implementations and plugins every tool in this presentation is easily capable to be used in Ant build process

ANT - AlternativesIts plenty of valuable Ant alternatives. Choose the one that ﬁts better your needs

Code Base: UNIT TEST RUNNERWebsites: DEPENDENCY RESOLVER

Code Base: JS TEST DRIVERWebsites: DEPENDENCY RESOLVER

JS Test DriverJs Test Driver is the most complete javascript unit test runneravailable external api integration jasmine and qunit as well as its own api test report console return and junit compatible report smooth integration both locally and on a build machine

How does it work?It runs a serveropens browsersruns test suitesretrieves results on the consolecreates a report in JUnit format

Pitfalls?testing asynchronous execution is a mess

Sinon.jsa standalone javascript library with unit test utilities fake server manage server response in order to test ajax interaction fake timer in order to test timeouts, intervals, animation callbacks... spy, stub & mock in order to make advanced assertions on object interaction

JS Test Driver - AlternativesEnv.JSa javascript DOM implementation in javascript engines: it ispossible to fake browser execution and run unit tests.Yetiit stands for Yahoo Easy Test Interface and it is a very promisingunit test runner, potentially the most suitable alternative.

Code Base: JS TEST DRIVERWebsites: DEPENDENCY RESOLVER

Code Base: JS TEST DRIVERWebsites: APACHE IVY

Apache IvyIvy is a simple, powerful and well documented dependencymanagerIt has a full integration in ANT build systemand, again, it’s really simple, especially if you keep a ﬁle systembased versioning.

Ivy AlternativesIs there any alternative? I haven’t found anything simple enough to compete with Ivy straightforwardness: other solutions (ie. maven) drove me nuts

1. Disclaimer 2. You Need a Strategy 3. Continuous Integration4. Choose Your Tools 5. The Environment 6. In The Wild 5. The Environment

THE ENVIRONMENT I like boring things Andy Warhol

Javascript Repository

Javascript Repository/ dist libs src tools build.xml

Javascript Repository/ dist libs src tools build.xml /tools/ jslint JsTestDriver-1.3.1

Javascript Repository/ /src/ dist form-validator libs slider src src tools slider.js build.xml test slider.test.js /tools/ jsTestDriver.conf jslint version.prop JsTestDriver-1.3.1 twitter-widget ...

Javascript Repository /libs/ jquery-1.5.1.min.js sinon-1.0.0.js/ /src/ dist form-validator libs slider src src tools slider.js build.xml test slider.test.js /tools/ jsTestDriver.conf jslint version.prop JsTestDriver-1.3.1 twitter-widget ...

basepath: ../..server: http://127.0.0.1:9876load: - libs/sinon-1.0.0.js - libs/jquery-1.5.1.min.js - src/slider/src/slider.js - src/slider/test/slider.test.js JsTestDriver.conf

Lets code

Testvar test = new TestCase("Slider.test", { setUp: function(){ }, tearDown: function(){ }}); Codevar slider;

Testvar test = new TestCase("Slider.test", { setUp: function(){ /*:DOC += <ul id="foo"><li></li><li></li></ul> */ }, tearDown: function(){ }}); Codevar slider;

Testvar test = new TestCase("Slider.test", { setUp: function(){ /*:DOC += <ul id="foo"><li></li><li></li></ul> */ }, testSliderIsAPlugin: function(){ var test = function(){ $("slidable").slider(); }; assertNoException(test); }, tearDown: function(){ }}); Codevar slider;

JS Test Driver in action

Testvar test = new TestCase("Slider.test", { setUp: function(){ /*:DOC += <ul id="foo"><li></li><li></li></ul> */ }, testSliderIsAPlugin: function(){ var test = function(){ $("slidable").slider(); }; assertNoException(test); }, tearDown: function(){ }}); Codevar slider;

Testvar test = new TestCase("Slider.test", { setUp: function(){ /*:DOC += <ul id="foo"><li></li><li></li></ul> */ }, testSliderIsAPlugin: function(){ var test = function(){ $("slidable").slider(); }; assertNoException(test); }, tearDown: function(){ }}); Code(function($){ $.fn.slider = function(){};}(jQuery));

JS Test Driver in action

Javascript Repository /libs/ jquery-1.5.1.min.js sinon-1.0.0.js/ /src/ dist form-validator libs slider src src tools slider.js build.xml test slider.test.js /tools/ jsTestDriver.conf jslint version.prop JsTestDriver-1.3.1 twitter-widget ...

Javascript Repository /dist/ /libs/ form-validator-1.0.0 jquery-1.5.1.min.js form-validator-1.1.0 sinon-1.0.0.js slider-1.0.0/ /src/ dist slider.min.js form-validator libs twitter-widget-1.0.0 slider src twitter-widget-1.0.1 src tools twitter-widget-2.0.0 slider.js build.xml ... test slider.test.js /tools/ jsTestDriver.conf jslint version.prop JsTestDriver-1.3.1 twitter-widget ...

Test Ajax Callvar test = new TestCase("mylib.test", { testAjaxCallSuccess: function(){ var server = sinon.useFakeServer(); server.respondWith("GET", "/some/article/comments.json", [200, {"Content-Type":"application/json"}, [{ id:12, comment:"Hello"}]]); var callback = sinon.spy(); myLib.getCommentsFor("/some/article", callback); server.respond(); assert(callback.calledWith([{ id:12, comment:"Hello"}])); server.restore(); }});

Test Ajax Timeoutvar test = new TestCase("mylib.test", { testAjaxCallTimeout: function(){ var server = sinon.useFakeServer(); server.respondWith("GET", "/some/article/comments.json", [200, {"Content-Type":"application/json"}, [{ id:12, comment:"Hello"}]]); var timeoutCallback = sinon.spy(); var clock = sinon.useFakeTimers(); myLib.getCommentsFor("/some/article", function(){}, {onTimeout: timeoutCallback, timeout:2500}); clock.tick(2500); assert(timeoutCallback.called()); server.restore(); }});

Website Solution

Website Solution/ css img inc scripts .htaccess index.php

Website Solution /scripts/ public/ css src img tools inc apache-ivy-2.2.0 scripts yui-compressor-2.4.6 .htaccess ivy-settings.xml index.php mywebapp.xml ivy.xml

<ivy-module version="2.0"> <info organisation="libs" module="myWebSite" /> <dependencies> <dependency org="libs" name="slider" rev="1.0.0"/> <dependency org="libs" name="twitter-widget" rev="2.0.0"/> <dependency org="libs" name="form-validator" rev="1.1.0"/> </dependencies></ivy-module> ivy.xml

1. Disclaimer 2. You Need a Strategy 3. Continuous Integration4. Choose Your Tools 5. The Environment 6. In The Wild 6. In The Wild

IN THE WILDIn the wild, there is no health care. Dwight Schrute (the ofﬁce)

so? what is it about? control & knowledge

Inversion of control freakness 1 2 I am not a control freak.Gain control and then leave to themachine the responsibility to check everything; focus on knowledge.1) Inspired (and I mean copied) by http://blog.jonathanoliver.com/ - Inversion of Control Freak:Dependency Injection, Domain-Driven Design, Test-Driven Development techniques2) actually I am

LOOKING FORWARDJavascript had several springs buzzwords: DHTML before and Ajax after big frameworks: from Prototype+Scriptaculous to jQuery future: HTML5

LOOKING FORWARDJavascript had several springs buzzwords: DHTML before and Ajax after big frameworks: from Prototype+Scriptaculous to jQuery future: HTML5on browser

LOOKING FORWARDJavascript had several springs buzzwords: DHTML before and Ajax after big frameworks: from Prototype+Scriptaculous to jQuery future: HTML5on browser then there’s a brand new world on server: node.js, noSQL databases (couchdb, mongodb..)

LOOKING FORWARD the further we look at, the more control we need

LOOKING FORWARD the further we look at, the more control we need javascript is a programming language

LOOKING FORWARD the further we look at, the more control we need javascript is a programming language javascript is a serious business.

LOOKING FORWARD the further we look at, the more control we need javascript is a programming language javascript is a serious business. and, most of all...

javascript kicks asses

javascript is money

marco@fromthefront.ithttps://github.com/cedmax@cedmax

One last word..

YOOX Launch & Learn - Javascript as a programming language

by Marco Cedaro

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