Demystifying Modern Javascript

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“Modern”

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Tim Griesser @tgriesser

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Tim Griesser @tgriesser

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Tim Griesser @tgriesser

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Tim Griesser @tgriesser

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? ? ? ? ? ?

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… but if it’s just JavaScript …

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Single Page Web Apps

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Single Page Web Apps

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SPA Architecture

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SPA Architecture Routes

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SPA Architecture REST Routes

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SPA Architecture SOLID REST Routes

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SPA Architecture SOLID Services REST Routes

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SPA Architecture SOLID Services REST Routes

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SPA Architecture SOLID Services REST Routes

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SPA Architecture SOLID Services REST Routes A mess of jQuery

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SPA Architecture SOLID Services REST Routes A mess of jQuery

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SPA Architecture SOLID Services REST Routes A mess of jQuery and javascript

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SPA Architecture SOLID Services REST Routes A̩̱̞ ̥͈͓̱͇̫̗ m͎ e̶̠̻s̨s͙̖ ̵͍͈̖ o͙͚̫͙͖̯ͅ f̧̤ͅ ̯ j̨̩͔͓̠͎ Q̜u̳̞é̫͇r̮̙y̼̩̘̤͕̕ͅ ̖̩̦ ̹̺͚ ̹ ̰ ̱a̴̟n ͜ d ̪͜ ̘͓͍ j̷̗̦ a͟ ͈̙̗ v̙͖ͅ a̹̤̦s̵̹̙̱̘ c͏̰̱͖r͕͍͇̤̻̣ i ̯̩̹̮̻ p̮͖̤̭ t̻̭͓̫ ̩̬̙͜

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SPA Architecture

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What is wrong with these JS people?

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JavaScript can be incredibly subjective

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JavaScript can be incredibly flexible

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Frameworks

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• Library, not a framework. 6.5k (min/gzip) ! • Minimal Set of data-structuring (models, collections) and UI (views, urls) primitives for web applications ! • Very opinionated regarding REST-ful Models & Syncing ! • Not-so-much on Views, UI, Project Structure ! • Awesome “real world apps” list

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• Framework for Building “Ambitious Web Applications” ! • Most similar to Laravel, batteries included approach making decisions for you, so you’re left implementing what makes your app different ! • More of a community ! • Larger footprint (71k min/gzip)

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• HTML, “enhanced” for modern browsers ! • Inline declarations in HTML, encapsulating style & behavior in custom elements (directives) ! • Dependency Injection / Inversion of Control, Promises ! • Lots of resources, quickly gaining momentum ! • 2.0 will be more “Web Component” based

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• Focus on Immutability: state is the root of all evil in web applications ! • JSX (compile to javascript HTML) ! • Virtual DOM ! • Comparable to angular, less conceptual overhead ! • Production use by Facebook, Instagram

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17,938 10,143 23,641 6,302

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17,938 10,143 23,641 6,302 Which should I use?

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17,938 10,143 23,641 6,302 Which should I use? (drumroll)

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…it doesn’t matter

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1. Debugging Javascript 2. “this” 3. Other practical tips “The Rest of the Talk”

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Alert Driven Development

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console.log()

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console.dir()

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console.error() console.log + stack trace

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debugger

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breakpoint debugging

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live editing

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Backbone Debugger

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Ember Debugger

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Angular Debugger

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React Debugger

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https://developer.chrome.com/devtools/docs/authoring-development-workﬂow https://developers.google.com/chrome-developer-tools/docs/tips-and-tricks

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this

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$(this)

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this === context

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“left of the dot” user.sayName() / / this === user user.friends.add() / / this === user.friends console.log('Hi.') / / this === console someFunction() / / global

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“left of the dot” Passing a function as an argument loses its value of "this" user.create(name, callback);

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“left of the dot” user.create("Snappy", user.greet);

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“left of the dot” user.create("Snappy", usergreet);

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“left of the dot” user.create("Snappy", function() { user.greet(); });

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“left of the dot”

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…except when it’s not fn.bind(context) fn.call(context, arg1, arg2…) fn.apply(context, [array || arguments])

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arguments fn.apply fn.call call_user_func_array() func_get_args() call_user_func()

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When would I ever use this?

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Inheritance

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Monkey-Patching

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JavaScript Is Very Object Oriented

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JavaScript Is Confusingly Object Oriented, with Prototypes

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$.fn

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$.fn === $.prototype

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functions are constructors var User = function(name) { this.name = name; }; User.prototype.sayName = function() { alert("Hello " + this.name); }; ! var user = new User("Tim");

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functions are constructors class User { ! public function __construct($name) { $this-‐>name = $name; } ! public function sayName() { echo("Hello " . $this-‐>name); } } ! var user = new User("Tim");

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“I can write OO code similar to PHP”

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functions are also objects User.name = "Not Tim"; ! console.log(User.name) // "Not Tim" ! var user = new User("Tim"); ! console.log(user.name) // "Tim"

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If you’re ever confused about what’s what… ! Remember: Just throw a debugger in there and take a look around

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Additional Practical Tips

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Arrays are Objects, Objects are References

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var x = {};

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var x = {}; $x = [];

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var x = {}; $x = [];

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$x = new StdClass();

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var User = function(name) { this.name = name; }; ! User.prototype.nicknames = []; ! User.prototype.sayName = function() { alert("Hello " + this.name); }; !

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var user = new User("Timothy"); ! user.nicknames.push("Tim"); ! console.log(user.nicknames); // ['Tim']

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var user = new User("Timothy"); ! user.nicknames.push("Tim"); ! console.log(user.nicknames); // ['Tim'] ! var otherUser = new User("Joseph"); ! otherUser.nicknames.push("Joe"); ! console.log(otherUser.nicknames); // ['Tim', 'Joe']

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var Account = Ember.Object.extend({ users: [] }); var Account = Backbone.Model.extend({ users: [] });

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var account = new Account(); ! account.users.push('Name'); ! var anotherAccount = new Account(); ! anotherAccount.users // ['Name'];

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Always create objects & arrays inside a constructor, almost never put them on a prototype ! Again, use the debugger!

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Scopes, References, GC can be really confusing ! Again: use the debugger!

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Avoid throwing JS in your view partials ! Single JS file, split up functionality based on URL MVC + JS

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(not just for node)

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“My Front-End Toolkit” /watchify

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“My Front-End Toolkit” /watchify

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JavaScript, it’s not all terrible. ! The End ! @tgriesser

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Photos & Links • Links: • https://developer.chrome.com/devtools/docs/authoring-development-workﬂow • https://developers.google.com/chrome-developer-tools/docs/tips-and-tricks • http://superherojs.org • http://browserify.org/ • https://github.com/aaronlord/laroute • https://github.com/node-inspector/node-inspector • Photos: • https://www.ﬂickr.com/photos/xjrlokix/8192703395/in/photostream/ • http://www.fastcolabs.com/3015764/sticker-styling-14-laptop-covers-from-tech-innovators