shunwen

omg = [1,2,3]
omg ===Array # => false
Array === omg # => true
omg.is_a? Array # => true

tmp = 1
tmp.is_a? Array #=> false

shunwen

module RomanNumeral

  VALUES_OF_LETTERS = { I: 1, V: 5, X: 10, L: 50, C: 100, D: 500, M: 1000 }
  MODERN_ROMAN_PATTERNS = { CM: 900, CD: 400, XC:90, XL: 40, IX: 9, IV: 4 }

  def self.i_to_old_roman int
    i_to_roman int, VALUES_OF_LETTERS
  end

  def self.i_to_modern_roman int

shunwen

require 'json'
require 'csv'

SAMPLE_DATA = {"key1": "value1", "key2": "value2", "key3": "value3"}

headers = JSON.parse(SAMPLE_DATA).keys
input_lines = File.readlines "path/to/log/file"
parsed_line = 0

csv_file = CSV.open "path/to/file.csv", "w"

shunwen

# See http://docs.opscode.com/config_rb_knife.html for more information on knife configuration options

current_dir = File.dirname(__FILE__)
log_level                :info
log_location             STDOUT
node_name                "YOUR OPSCODE USERNAME" # The actual name will be set when provisioning
client_key               "#{ENV['HOME']}/.chef/USERNAME.pem"
validation_client_name   "ORGANIZATION_NAME-validator"
validation_key           "#{ENV['HOME']}/.chef/ORGANIZATION_NAME-validator.pem"
chef_server_url          "https://api.opscode.com/organizations/ORGANIZATION_NAME"

shunwen

mkdir test_prj
cd test_prj
 
berks init
      create  Berksfile
      create  Thorfile
      create  .gitignore
         run  git init from "."
      create  Gemfile
      create  Vagrantfile

shunwen

name 'base'
description 'Create users and sudoers, configure ssh, set timezone and swap'

run_list "recipe[apt]", "recipe[user::data_bag]", "recipe[base::bootstrap]",
         "recipe[build-essential]", "recipe[git]"

default_attributes(
  users: ['config'],
  authorization: {
    sudo: {

shunwen

require 'flickraw'
require 'mini_magick'
require 'parallel'

def get_photo_urls_from_photoset(flickr, photoset_id)
  total_pages = nil
  current_page = 1
  urls = []
  opts = {
    photoset_id: photoset_id,

shunwen

# 1) Create your private key (any password will do, we remove it below)

$ cd ~/.ssh
$ openssl genrsa -des3 -out server.orig.key 2048


# 2) Remove the password

$ openssl rsa -in server.orig.key -out server.key

shunwen

def foo
  some_function(true, { :before => {a: 1},
                        :after => {b: 2} })
  call_block { do_something }
end

def bar
  case @var
  when 1
    print [1..42]

shunwen

Vagrant.configure("2") do |config|
  config.vm.hostname = "NODE NAME" # will be the node name on chef-server.
  config.vm.box = "BOX NAME"
  config.vm.box_url = "BOX IMAGE DOWNLOAD URL WHEN BOX DOES NOT EXIST"
  config.vm.boot_timeout = 180 # Raise error when bootup takes too long

  config.omnibus.chef_version = :latest # Use the latest chef version on this box

  #config.vm.network :private_network, ip: "33.33.33.10" # THIS CAUSES SSH PROBLEM, remove it