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module M
  def self.included(base)
    base.extend(ClassMethods)
  end

  module ClassMethods
    def b
      puts 'b'
    end
  end

ttanimichi

module M
  def self.prepended(base)
    class << base
      self.prepend(ClassMethods)
    end
  end

  module ClassMethods
    def c
      puts 'c'

ttanimichi

# depends on save, save!, create, create!
module RetryIfCollide
  extend ActiveSupport::Concern

  def save(*)
    self.class._retry_if_collide { super }
  end

  def save!(*)
    self.class._retry_if_collide { super }

ttanimichi

echo "This script requires superuser access to install rpm packages."
echo "You will be prompted for your password by sudo."

# clear any previous sudo permission
sudo -k

# run inside sudo
sudo sh <<SCRIPT

  # add GPG key

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require 'test/unit'

class TestSample < Test::Unit::TestCase
  def setup
  end

  def test_sample
    coins = [1, 5, 50]
    target_coin = 10
    assert do

ttanimichi

def method_chain_stub
  object = Object.new
  object.instance_eval do
    self.singleton_class.class_eval do
      define_method(:method_missing) { |name| self }
    end
  end
  object
end

ttanimichi

# Rubyによる依存関係逆転の原則

class Button
  # 規約: 引数`device`は `on?`, `turn_on`, `turn_off`に反応すること
  def initialize(device)
    @device = device
  end

  def press
    if @device.on?

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run ->(env) { [200, { 'Content-Type' => 'text/html' }, ['Hello, World']] }

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(defun note ()
  (interactive)
  (let ((path "~/Dropbox/Notes/text/") (filename (format-time-string "%Y%m%d%H%M%S")))
    (if (file-directory-p path) (switch-to-buffer (find-file (concat path filename ".md")))
      (message (concat "No such directory: " path)))))
(global-set-key (kbd "C-c m") 'note)

(defun ruby ()
  (interactive)
  (let ((path "~/Dropbox/Notes/ruby/") (filename (format-time-string "%Y%m%d%H%M%S")))

ttanimichi

Ruby および Rails 用の auto-complete.el の辞書

# Gemfile
source 'https://rubygems.org'

gem 'rails', '4.2.0'
gem 'pg'