Lecture 00

Motivation

Imagine a language where

• you don't have to compile anything
• you can just start writing your code without long ceremonies
• you can use for server scripts, one-liners as well as web and desktop apps
• you can easily improve the behavior of included library
• the class name is always CamelCase and method name snake_case
• writing callbacks is natural
• [] + [] = []
• writing tests is obvious thing to do (and necessary?)
• there is one reference implementation and more other implementations (+ ISO specification)

What's written in Ruby?

• languages: Ruby (Rubinius), compilers (LessJS)
• web apps: Github, Twitter
• dev ops tools: Puppet/Chef/Vagrant
• cloud platforms: OpenShift
• cloud management: DeltaCloud
• VIM/Emacs scripts
• static pages generators - Jekyll
• programming tools

Basic ecosystem

• ruby --help
• RVM/rbenv - getting different versions of ruby and libraries

rvm install ruby-1.9.3
rvm use ruby-1.9.3
rvm gemset create fimu
rvm 1.9.3@fimu

• RubyGems - sharing the libraries with the rest of the world

gem list
gem install pry

• irb - try the things out

irb
>> "dlroW olleH".reverse

• pry - try the things out in the wild

def hello(name)
  binding.pry
end
hello("World")

• git - source code version management

git clone git://github.com/municz/study-materials.wiki.git
cd study-materials.wiki
echo "Hello World" >> Home.md
git add .
git commit -m "My Useless Change"