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Introduction to Web
Applications
Tobias Pfeiffer
@PragTob
pragtob.wordpress.com
Today
What is a web application?
Not rocket science
I am Rails
(and So Can You!)
Programming is fun!
What you are going
to build today
So what is a web application?
Presented in a
web browser
Runs on a server...
...or the cloud
is dynamic
A high level overview
High level overview
High level overview
High level overview
Request
High level overview
High level overview
Answer
High level overview
Answer
High level overview
What parts does a web
application consist of?
Web Application
Front End
Back End
Front End
Back End
CSS
HTML
JavaScript
CSS
HTML
JavaScript
Structure and content
CSS
HTML
JavaScript
Styling to transform...
...this...
...into this.
CSS
HTML
JavaScript
Back End
CSS
HTML
JavaScript
Back End
CSS
HTML
JavaScript
Logic
Infrastructure
Logic
Infrastructure
Logic
● Behaviour
● Implements the business logic
● Ties all the parts together
● Generates content
Ruby on Rails
But what is Ruby on Rails?
A web application
framework written in Ruby
● A general purpose programming
language
● Principle of least surprise
● Invented by Yukihiro Matsumoto
"I hope to see Ruby help
every programmer in the
world to be productive, and to
enjoy programming, and to be
happy. That is the primary
purpose of Ruby language."
Yukihiro Matsumoto
Ruby on Rails
● Framework written in Ruby
● set of functionality to help write web
applications
– Connecting to the database (ActiveRecord)
– Generating HTML (ERB)
– Pays attention to security
– … and so much more!
● Model View Controller
● You write in Ruby
Logic
Infrastructure
Web Server
Logic
Infrastructure
Storing all your
data...
...in giant tables
Recap
Logic
Storage
Infrastructure
CSS
HTML
JavaScript
Web Application Landscape
Logic
Storage
Infrastructure
CSS
HTML
JavaScript
Web Application Landscape
Bootstrap
DOM
Ruby on Rails
Sqlite
WEBrick
Ruby
Bento Box Exercise
● Sort technologies and associated words
into the landscape
● 5 minutes time
Logic
Storage
Infrastructure
CSS
HTML
JavaScript
Web Application Landscape
Bootstrap
DOM
Ruby on Rails
Sqlite
WEBrick
Ruby
Bento Box Exercise
● jQuery
● Django
● Unicorn
● PHP
● Python
● XML
● Java
● MongoDB
Logic
Storage
Infrastructure
CSS
HTML
JavaScript
Web Application Landscape
Bootstrap
XML
DOM
jQuery
Ruby on Rails
Sqlite
Unicorn
WEBrick
MongoDB
Ruby
PHP Python
Django
Java
Question time
?
Where to go from here?
● I gather resources here, such as:
– http://pragtob.github.io/rails-beginner-cheatsheet/
– http://ruby.railstutorial.org/
– http://rubymonk.com/
– http://www.codeschool.com/courses/rails-for-zombies
– http://rubykoans.com/
– http://railscasts.com/
● Rails Girls Berlin project groups
Thank you and enjoy
coding!
Tobias Pfeiffer
@PragTob
pragtob.wordpress.com
listen to me talking about learning Ruby (German)
Photo credit
● http://www.flickr.com/photos/captainkimo/5918836159/
● http://www.flickr.com/photos/weppos/7486411688/
● http://www.flickr.com/photos/railsgirlsberlin/7882839698/in/photostream
● http://www.flickr.com/photos/nirak/644336486/

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