Ruby v cpp_preso

Ruby!? Yep.

The Plan• Language Intro & Features• Environment Install• Hello World Sinatra App on Heroku

C++• Statically Typed Compiled Language• int x = 2;• x = “a”;• uh oh...

Ruby• Dynamically Typed Interpreted Scripting Language• x=2• x = “a”• Mmhhmm

Ruby Features• http://ruby-lang.org/en/about• REPL• Rubygems• Everything is an object• Monkey patching• Easy closures• Mixins

REPLIt’s How You Learn

What it is, yo?!• REPL = Read Eval Print Loop• Err...• It’s a command line tool to write ruby• IRB & Pry• Pry :: http://vimeo.com/26391171

In C++• A C++ REPL?• I guess...• http://www.artiﬁcialworlds.net/wiki/IGCC/ IGCC

RubygemsPackage Management Made Easy

There’s a Gem for That• Wait, there isn’t?• Write your own and publish• > gem install rails > rails new my_sweet_app > cd my_sweet_app > rails s > open http://0.0.0.0:3000/• You now have the beginnings of a web application• http://rubygems.org/

Everything Is An Object

Literally...• 5.class => Fixnum• “What?!”.length => 6• “What?!”.length.class => Fixnum

I Don’t Believe It• 42.class => Fixnum• 42.class.superclass => Integer• 42.class.superclass.superclass => Numeric• 42.class.superclass.superclass.superclass => Integer• 42.class.superclass.superclass.superclass.superclass => Object

Monkey Patching

Too Silly To Be Real• Just kidding• Crazy language ﬂexibility• class Fixnum def to_kittens return to_s << “ kitten” if abs == 1 to_s << “ kittens” end end• 5.to_kittens => “5 kittens”• -1.to_kittens => “-1 kitten”

Easy Closures

Actually...• In ruby, they’re called blocks• Enumerators (Loops)• 42.times do p “What is the meaning of life?” end• [ 1 , 2 , 3 ].each do |i| p i.to_kittens end

Mixins...

...Use Them• Composition vs. (Multiple?) Inheritance• Keep your code fresh and clean• module Kittens def to_kittens return to_s << “ kitten” if abs == 1 to_s << “ kittens” end end• Fixnum.include Kittens• 5.to_kittens => “5 kittens”

Let’s Get Setup RTFM

Command Line• Mac: Terminal.app• Mac: iTerm 2 alpha - http://iterm2.com• Windows: cmd.exe• Windows: Cygwin - http://cygwin.com• MSys Git - http://code.google.com/p/ msysgit/

Package Installer• Mac: homebrew - https://github.com/mxcl/ homebrew• Windows: Uhhh...

Ruby• Mac: > brew install ruby• Windows: http://rubyinstaller.org/

Ruby Version Managers• Why do we need these?• Mac: rvm - https:// rvm.beginrescueend.com/• Windows: pik - https://github.com/ vertiginous/pik

Git• Mac: http://git-scm.com/download• Windows: Cygwin packages/preferences

A Nice Little Web App

Sinatra• Your ﬁrst web app• http://www.sinatrarb.com/

Heroku• We’ll need to setup a few more things• Gemﬁle• Procﬁle• Git repo

Gemfile• Tells heroku which gems we’ll need• > gem install bundler• Add a file called Gemfile (capital G is important) with the following contents... source :rubygems gem “sinatra” gem “heroku”, :group => :development• > bundle

Procfile• Tells heroku how to boot our web app• Add a file called Procfile (capital P is important) with the following contents... web: ruby -rubygems hi.rb -p $PORT

Git Repo• Run the following in your terminal• > git init > git add . > git commit -m “my ﬁrst git commit!”

Heroku Again• Sign Up - http://heroku.com• > heroku apps:create --stack=cedar > git push heroku master > heroku open• If your heroku commands aren’t working, try prepending them with “bundle exec” e.g. > bundle exec heroku open

http://quickleft.com	32
http://www.quickleft.com	9
http://www.hanrss.com	6

Ruby v cpp_preso

by jessicard

Accessibility

Categories

Upload Details

Usage Rights

3 Embeds 47

Statistics

Ruby v cpp_preso Presentation Transcript

Ruby v cpp_preso

by jessicard

Accessibility

Categories

Upload Details

Usage Rights

3 Embeds 47

Statistics

Ruby v cpp_preso Presentation Transcript

Let LinkedIn power your SlideShare experience

Let LinkedIn power your SlideShare experience

Customize SlideShare content based on your interests

Keep up to date when your LinkedIn contacts post on SlideShare