Javascript as a programming language - Paris Web

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Javascript As A Programming Language

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Javascript As A Programming Language Versioning, Test Driven Development & Continuous Integration IS

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Javascript As A Programming Language Versioning, Test Driven Development & Continuous Integration IS

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Hello, who’s speaking?

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Hello, who’s speaking? Marco Cedaro @cedmax

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

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Actually I am: a Frontend Developer at Spreaker.com Hello, who’s speaking? Marco Cedaro @cedmax

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Actually I am: a Frontend Developer at Spreaker.com a conference organizer with From The Front Hello, who’s speaking? Marco Cedaro @cedmax

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Actually I am: a Frontend Developer at Spreaker.com a conference organizer with From The Front and a javascript pervert Hello, who’s speaking? Marco Cedaro @cedmax

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Bologna, Italy

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something in common with Robert Nyman

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something in common with Robert Nyman

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I believe I can ﬂy

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I believe I can ﬂy

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I believe I can ﬂy Be brave. Take risks. Nothing can substitute experience. Paulo Coelho

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once upon a time

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we had no control once upon a time

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we had no control javascript was the land of the brave once upon a time

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we had no control javascript was the land of the brave we were fearless and unconscious once upon a time

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we had no control javascript was the land of the brave we were fearless and unconscious we were proud of being like that once upon a time

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just like them

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kitty hawk

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but life goes on

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web engineer had a very bad opinion of us once upon a time

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but it wasn't fair

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we didn't have IDEs & tools they did but it wasn't fair

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we didn't have IDEs & tools they did actually it was our own fault but it wasn't fair

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we didn't have IDEs & tools they did actually it was our own fault we were not ready but it wasn't fair

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we didn't have IDEs & tools they did actually it was our own fault we were not ready and javascript was neither but it wasn't fair

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but, again, life goes on...

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...and on...

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and on..

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it's not about the language itself

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GREAT POWERS...

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Frontend developers have to claim their role in development roadmap and business strategy

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Javascript is a serious business

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how serious?

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something we can achieve less bandwidth and server load loading resources and content when needed

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something we can achieve less bandwidth and server load loading resources and content when needed performance boosts that can lead to better conversion rates

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something we can achieve less bandwidth and server load loading resources and content when needed performance boosts that can lead to better conversion rates cross platform development: less maintenance costs

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less bandwidth and server load loading resources and content when needed performance boosts that can lead to better conversion rates cross platform development: less maintenance costs money

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how serious?

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this serious

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what's missing?

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what's missing?

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what's missing? If I had nine of my ﬁngers missing I wouldn't type any slower. Mitch Hedberg

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IDEs & Tools

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the attitude

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a strategy

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the small web agency The designer introduces a slider on some websites: ”it’s cool on apple store”. The developer gets a jQuery plugin online

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the small web agency The designer introduces a slider on some websites: ”it’s cool on apple store”. The developer gets a jQuery plugin online Major release of the most used browser. A small ﬁx has been released, they have to change 5 ﬁles in 5 different projects. Oh damn! There’s no mouse wheel integration! should they ask for support or should they change the library by themself?

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am I the only one or there’s something wrong?

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the big corp The client-side architecture has been built on the most known and supported framework 2006

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the big corp The client-side architecture has been built on the most known and supported framework 2006 Everything seems to be ﬁne, except that the well known framework was being replaced by a powerful new one 2008 - 2010 They were forced to change the whole codebase at once to reduce maintenance and development costs 2011

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here we are again

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attitude, strategy...

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...and foresight

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WARNING!

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continuous integration

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continuous integration

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continuous integration A software development practice where members of a team integrate their work frequently [...] to detect integration errors as quickly as possible. Martin Fowler

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I Build So Consistently

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I Build So Consistently identify

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I Build So Consistently identify write a build script

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I Build So Consistently share identify write a build script

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I Build So Consistently share identify write a build script make it continuous

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How can we take advantages from a continuous integration process?

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rationalize your workﬂow

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deploy stable versions

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Separate the codebase

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unit test your code

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basically

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basically

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basically ie7

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choose your tools

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choose your tools

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choose your tools A man cannot be too careful in the choice of his enemies Oscar Wilde

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No content

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JSHINT

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a code quality tool

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like Douglas Crockford's JSLint a code quality tool

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like Douglas Crockford's JSLint but a code quality tool

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like Douglas Crockford's JSLint but customizable a code quality tool

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a tool for stupid?

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JS HINT

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JS TEST DRIVER JS HINT

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once upon a time

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jsTestDriver

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jsTestDriver works from console

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jsTestDriver works from console runs a server

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jsTestDriver works from console runs a server opens browsers

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jsTestDriver works from console runs a server opens browsers runs test suites

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jsTestDriver works from console runs a server opens browsers runs test suites retrieves results in console

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build server

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build server

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build server

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how does testing works?

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have you seen Lost?

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how does it work?

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how does it work? write a test

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how does it work? write a test let it fail

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how does it work? write a test let it fail write the code

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how does it work? write a test let it fail write the code run the test again

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how does it work? write a test let it fail write the code run the test again refactor

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the environment

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It's the browser, baby

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It's the browser, baby

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The curious case of Javascript unit testing Unit testing is supposed to test a single atomic “unit” of functionality without dependencies on anything else

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The curious case of Javascript unit testing Unit testing is supposed to test a single atomic “unit” of functionality without dependencies on anything else This is where you start to run into serious dependency problems due to the interrelation with HTML and CSS What do you test? Usually how the user interface responds to user input. Actually, the realm of functional testing

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keep it real

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keep it real

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keep it real To all my homies working on the 9 to 5 Shaggy

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#140bytes

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I used to work with these guys

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_$ = (function() { var registered = {}; return { ! ! pub: function(event, memo) { ! ! ! if (registered[event] instanceof Array){ ! ! ! ! var handlers = [].concat(registered[event]); ! ! ! ! for (var i=0, h; (h = handlers[i]); i++){ ! ! ! ! ! h.call(this, memo); ! ! ! ! } ! ! ! } ! ! }, ! ! sub: function(event, handler) { ! ! ! if (typeof registered[event] === "undefined"){ ! ! ! ! registered[event] = []; ! ! ! } ! ! ! registered[event].push(handler); ! ! } }; })();

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_$.sub("customEvent", function(obj) { ! //DO STUFF }); _$.pub("customEvent"); _$.pub("customEvent", { prop : "value" });

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_$.sub("customEvent", function(obj) { ! //DO STUFF }); _$.pub("customEvent"); _$.pub("customEvent", { prop : "value" });

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_$.sub("customEvent", function(obj) { ! //DO STUFF }); _$.pub("customEvent"); _$.pub("customEvent", { prop : "value" });

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_$ = (function (_) { ! return { ! ! pub: function(a, b, c, d) { ! ! ! for (d=-1, c=[].concat(_[a]); c[++d];) c[d](b) ! ! }, ! ! sub: function(a, b) { ! ! ! (_[a] || (_[a] = [])).push(b) ! ! } ! } })({})

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[...] testPub: function(){! ! ! ! var a = 0;! ! ! _$.sub('testNotify', function(){ a = 1; }); ! ! _$.pub('testNotify'); ! ! assertEquals(1, a); ! }, ! ! ! ! testNotifyWithMemo: function(){!! ! ! var a = 0 ;! ! ! _$.sub('testNotify', function(memo){ ! ! ! ! a = memo.test; ! ! }); ! ! _$.pub('testNotify', {test: 1}); ! ! assertEquals(1, a); ! }, [...]

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[...] testPub: function(){! ! ! ! var a = 0;! ! ! _$.sub('testNotify', function(){ a = 1; }); ! ! _$.pub('testNotify'); ! ! assertEquals(1, a); ! }, ! ! ! ! testNotifyWithMemo: function(){!! ! ! var a = 0 ; ! ! _$.sub('testNotify', function(memo){ ! ! ! ! a = memo.test; ! ! }); ! ! _$.pub('testNotify', {test: 1}); ! ! assertEquals(1, a); ! }, [...]

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easy, uh?

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you will, eventually

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JS TEST DRIVER JS HINT

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JS TEST DRIVER SINON.JS JS HINT

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a mock library

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a mock library SPIES a function that records arguments, return value, the value of this and exception thrown (if any) for all its calls.

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a mock library SPIES a function that records arguments, return value, the value of this and exception thrown (if any) for all its calls. STUBS functions (spies) with pre-programmed behavior.

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a mock library SPIES a function that records arguments, return value, the value of this and exception thrown (if any) for all its calls. STUBS functions (spies) with pre-programmed behavior. MOCKS functions (spies) with pre-programmed behavior (stubs) as well as pre-programmed expectations.

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[...] testMyLibRegistersToSystemOnEvent: function(){! ! ! ! var spy = sinon.spy(_$, 'watch');! ! ! //DO STUFF TO INIT YOUR LIB ! ! assertTrue(spy.calledWith('SysyemOn')); ! }, ! ! ! ! testMyLibLoggedNotLogged: function(){!! ! ! var stub = sinon.stub(User, 'isLogged');! ! ! stub.returns(true); ! ! //DO STUFF && ASSERTIONS ! ! stub.returns(false); ! ! //DO STUFF && ASSERTIONS ! }, [...]

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[...] testMyLibRegistersToSystemOnEvent: function(){! ! ! ! var spy = sinon.spy(_$, 'watch');! ! ! //DO STUFF TO INIT YOUR LIB ! ! assertTrue(spy.calledWith('SystemOn')); ! }, ! ! ! ! testMyLibLoggedNotLogged: function(){!! ! ! var stub = sinon.stub(User, 'isLogged');! ! ! stub.returns(true); ! ! //DO STUFF && ASSERTIONS ! ! stub.returns(false); ! ! //DO STUFF && ASSERTIONS ! }, [...] SPY

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[...] testMyLibRegistersToSystemOnEvent: function(){! ! ! ! var spy = sinon.spy(_$, 'watch');! ! ! //DO STUFF TO INIT YOUR LIB ! ! assertTrue(spy.calledWith('SystemOn')); ! }, [...] MOCK

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[...] //testMyLibRegistersToSystemOnEvent: function(){! ! ! ! //var spy = sinon.spy(_$, 'watch');! ! ! //DO STUFF TO INIT YOUR LIB ! ! //assertTrue(spy.calledWith('SysyemOn')); ! //}, ! ! testMyLibRegistersToSystemOnEvent: function(){! ! ! ! var mock = sinon.mock(_$); ! ! mock.expect('watch').calledWith('SysyemOn'); ! ! //DO STUFF TO INIT YOUR LIB ! ! mock.verify(); ! }, [...] MOCK

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[...] testOnSuccessCallback: function(){! ! var server = sinon.useFakeServer(); server.respondWith("GET", "/art/12/comments.json", [200, {"Content-Type":"application/json"}, "[{ id:12, text:'Hello'}]"]); ! ! var spy = sinon.spy(); ! ! myLib.getCommentsFor("/art/12", spy); ! ! server.respond(); ! ! assert(spy.calledWith([{ id:12, text:"Hello"}])); ! }, [...] AJAX CALL

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JS TEST DRIVER SINON.JS JS HINT

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JS TEST DRIVER SINON.JS JS HINT YUI COMPRESSOR

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Everyone should be happy

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in the wild

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in the wild

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

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drawbacks at the beginning

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cost of change

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LOOKING FORWARD

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LOOKING FORWARD

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LOOKING FORWARD

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LOOKING FORWARD

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LOOKING FORWARD

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

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

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the further we look at, the more control we need LOOKING FORWARD let's get ready

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the further we look at, the more control we need LOOKING FORWARD let's get ready javascript is a programming language

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the further we look at, the more control we need LOOKING FORWARD let's get ready javascript is a programming language javascript is a serious business.

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

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javascript kicks asses

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javascript kicks asses http://spkr8.com/t/8718 http://cedmax.com @cedmax any question?