JoshCheek

Dir.chdir "/Users/josh/Desktop"

require 'streamio-ffmpeg'
path       = ARGV[0]
movie      = FFMPEG::Movie.new(path)
width      = 128
height     = 80
start_time = 2.0
end_time   = 3.0
frame_rate = movie.frame_rate

JoshCheek

Enumerables

What are they?

"Enumerable", in Ruby, is a set of methods for collections. They are used in all the common collection classes. This command will tell you which classes. Try to guess a few before you run it:

$ ruby -e 'p ObjectSpace.each_object(Class).select { |c| c < Enumerable }'

JoshCheek

require 'active_record'
ActiveRecord::Base.establish_connection adapter: 'sqlite3', database: ':memory:'

ActiveRecord::Schema.define do
  self.verbose = false
  create_table :users
end

User = Class.new ActiveRecord::Base

JoshCheek

class RandomCollectionQueue
  def initialize(seed, collection)
    random           = ::Random.new seed
    self.collection  = collection
    self.seed        = seed
    self.next_seed   = random.rand
    self.block_index = random.rand collection.size
    p [seed, next_seed]
  end

JoshCheek

# hypothetical implementation of nested methods
module Tetris
  extend self
  
  def add_block(board, block_definition, x, y=nil)
    block_height = block_definition.height_for_rotation(0)
    y ||= board.height + block_height
    
    is_within_board_width!
    is_not_below_board!

JoshCheek

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.....,,,:::::~==+=++?I??II777IIII7IIII?????+???I?IIIIIIIIII7II7$7$ZZZ$ZZOOOOOOZO
....,,,,:~::::~===+=++++??I77I777II??I???+++++???III?IIIIII77I$$ZZZOZZOZOO88OZOZ
....,,,:~~~~::~~=~=++++++?IIII777777I??+++==++???II?III7II777777$ZZ$$$$$$$77$Z77
,....,,:~~=~:=~~~==++???IIIIII777777$$I?+++++++??+??IIII7777$$$ZZ$$Z$$7$7$$7777$
,....,:~~~=+=~==~+++?????+?II777$$$Z777I?+++++=?++??II77$$$$ZOZZ$$Z$ZZ777777777$
:....,:~==++++??+==+++++?I777$$$$OOZ7777I++=+++++??III77$ZZZOZZZ$$$$$7777I7IIII7
~.....,:~==++===I77$Z$7Z$$ZZOO888ZZ$$7I7I??=====+??II77$$ZOZOZOOOZZZ$$7II7777777

JoshCheek

require 'factory_girl'  # => true
FactoryGirl::VERSION    # => "4.4.0"

what_the_fuck_is_self = nil                                                  # => nil
FactoryGirl.define do factory(:qhatev) { what_the_fuck_is_self = self } end  # => []

what_the_fuck_is_self.class  # => #<FactoryGirl::Declaration::Implicit:0x007fa19bb8c6a0 @name=:class, @ignored=false, @factory=#<FactoryGirl::Definition:0x007fa19bb8da28 @declarations=#<FactoryGirl::DeclarationList:0x007fa19bb8d9d8 @declarations=[#<FactoryGirl::Declaration::Implicit:0x007fa19bb8c6a0 ...>], @name=:qhatev, @overridable=false>, @callbacks=[], @defined_traits=#<Set: {}>, @to_create=nil, @base_traits=[], @additional_traits=[], @constructor=nil, @attributes=nil, @compiled=false>>

JoshCheek

require 'active_record'

ActiveRecord::Base.establish_connection adapter: 'sqlite3', database: ':memory:'

ActiveRecord::Schema.define do
  self.verbose = false
  create_table(:invoices) { |t| t.float :amount }
end

class Invoice < ActiveRecord::Base

JoshCheek

Setup Mac
  - Make sure you have xcode
  - Install homebrew (bottom of http://brew.sh)
    password: bbuser
  - $ brew install git rbenv ruby-build
    $ echo 'eval "$(rbenv init -)"' >> ~/.bash_profile
    new terminal window
    $ rbenv install 2.1.1
    $ rbenv global 2.1.1
    $ ruby -v

JoshCheek

The roster is in the back, sign in or we'll have to hunt you down!

implement scaffold
  guides at guides.rubyonrails.org
  docs at api.rubyonrails.org
  new rails project
  looking around ($ rails server)
  generate the scaffold (articles with a title, body, and timestamps)
  show how it works
  go over the request to response flow