timuruski

#! /usr/bin/ruby

LBRACE = '{'
RBRACE = '}'
LBRACKET = '['
RBRACKET = ']'
COMMA = ','
COLON = ':'
WHITESPACE = /\s/

timuruski

The Migratory Habits of Rails Developers

Table of contents:

• migration tasks
• new change syntax
• using models in a migration
• reversible migrations
• revert command

timuruski

The ABCs of Ruby

• A is for ARGF
• B is for blocks
• C is for CSV
• D is for DBM (Database Management library) or Dir or DATA
• E is for Enumerable and Enumerators
• F is for Fibers
• G is for GServer
• H is for Hash

timuruski

# Input
events = [
  event(status: 'IDLE', job: 1, date: '2014-01-01'),
  event(status: 'BUSY', job: 1, date: '2014-01-02'),
  event(status: 'BUSY', job: 1, date: '2014-01-03'),
  event(status: 'BUSY', job: 2, date: '2014-01-04'),
  event(status: 'BUSY', job: 2, date: '2014-01-05'),
  event(status: 'BUSY', job: 2, date: '2014-01-06'),
  event(status: 'IDLE', job: 2, date: '2014-01-07'),
  event(status: 'BUSY', job: 3, date: '2014-01-08'),

timuruski

# PROMPT
# ==========
PS1="\[\e[33m\]\h\[\e[0m\]:\[\e[4m\]\W\[\e[0m\] \$ "

# ALIASES
# =========
alias ls="ls -lh"

timuruski

require 'benchmark'

a = Array.new(10_000) { rand }

Benchmark.bm(20) do |bench|
  bench.report('sort <=>') { 10.times { a.sort { |x,y| y <=> x } } }
  bench.report('sort.reverse') { 10.times { a.sort.reverse } }
  bench.report('sort_by.reverse') { 10.times { a.sort_by(&:to_f).reverse } }
end

timuruski

$ which ruby
> /Users/timuruski/.rvm/rubies/ruby-2.0.0-p353/bin/ruby
$ time ~/.rvm/rubies/ruby-2.0.0-p353/bin/ruby -e "1 + 1"
> ~/.rvm/rubies/ruby-2.0.0-p353/bin/ruby -e "1 + 1"  0.03s user 0.01s system 93% cpu 0.034 total
$ time /usr/bin/ruby -e "1 + 1"
> /usr/bin/ruby -e "1 + 1"  0.00s user 0.00s system 73% cpu 0.005 total

timuruski

class Address
  include ActiveResource::Attributes
  string  :street_address, :street_address_2, :street_address_3, :leave_location,
          :city, :province_state, :country, :name, :phone_number, :special_instructions,
          :postal_zipcode, :leave_location, :company, :special_instructions, :attention_name
  boolean :is_residential, :addressable
end

timuruski

# PROMPT
# ==========

# This doesn't work?
status () {
  if [[ $? -gt 0 ]]; then
    printf "\[\e[31m\]\$\[\e[0m\]"
  else
    printf "\$"
  fi

timuruski

class CustomerList
  def initialize(account, filter = nil)
    @account = account
    @filter = filter
  end
  
  # That's right, attributes after initializer.
  attr_reader :account, :filter
end