Fosome

class TrafficLight
  
  def initialize
    @state = lights.first
  end
 
  def change_to(change)
    light = lights.find{|l| l.color == change.to_sym }
    raise ArgumentError, "Invalid traffic light: #{change}" unless light

Fosome

class Stank
  MONTHS = {
    "january"   => 1,
    "jan"       => 1,
    "february"  => 2,
    "feb"       => 2,
    "march"     => 3,
    "mar"       => 3,
    "april"     => 4,
    "apr"       => 4,

Fosome

ruby-1.9.3-p0 :011 > base = {:a => "a", :b => "b"}
 => {:a=>"a", :b=>"b"} 
ruby-1.9.3-p0 :012 > other = base
 => {:a=>"a", :b=>"b"} 
ruby-1.9.3-p0 :013 > other[:c] = "c"
 => "c" 
ruby-1.9.3-p0 :014 > base
 => {:a=>"a", :b=>"b", :c=>"c"} 
ruby-1.9.3-p0 :015 > 

Fosome

Bootstrapping for Rails Workshop

Go to Zed Shaw's guide on learning Ruby. http://ruby.learncodethehardway.org/book/

Read the preface. It will be better for you if you follow his advice. At some point or another, you are going to feel confused, frustrated, and disappointed ALL AT ONCE. This is normal. Keep calm, step away for a few hours, or days and then get back in there.

Exercise 0

You all should have relatively new Macs. Check your ruby version is 1.9.2 in Terminal. If you don't have 1.9.2 or higher, stop and send me a message. Install the text editor. The 2 commands he wants you to learn are

• cd said change directory. Google for more information. Learn what these commands are doing cd ~, cd .., and cd .
• mkdir said make directory. Google again. Run this command mkdir ~/ruby. Figure out what that did.

Fosome

function parse_git_branch {
  git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}

export PS1="\w\n\u@\h\e[0;36m\$(parse_git_branch)\e[m ‡ "