benjamintanweihao

class Blah
  def add(x, y)
    x + y
  end
end
# => nil
class Symbol
  def call(*args, &block)
    ->(o) { o.send(self, *args, &block) }
  end

benjamintanweihao

defmodule SecureRandom do
  @moduledoc """
  Ruby-like SecureRandom module.

  ## Examples

      iex> SecureRandom.base64
      "xhTcitKZI8YiLGzUNLD+HQ=="

      iex> SecureRandom.urlsafe_base64(4)

benjamintanweihao

defmodule Crypto do
    def md5(s) do
        list_to_binary(Enum.map(bitstring_to_list(:crypto.md5(s)), fn(x) -> integer_to_binary(x, 16) end))
    end
end

benjamintanweihao

# Video: http://rubyhoedown2008.confreaks.com/08-chris-wanstrath-keynote.html

Hi everyone, I'm Chris Wanstrath.

When Jeremy asked me to come talk, I said yes.  Hell yes.  Immediately.  But
then I took a few moments and thought, Wait, why?  Why me?  What am I supposed
to say that's interesting?  Something about Ruby, perhaps.  Maybe the
future of it.  The future of something, at least.  That sounds
keynote-y.

benjamintanweihao

defmodule Ring do
  def run(member_count, loop_count, message) do
    log(:ringleader, "building ring with #{ member_count - 1 } more nodes...")
    next_pid = spawn_link(__MODULE__, :build_ring, [member_count - 2, self])

    log(:ringleader, "sending initial message to #{ inspect(next_pid) }...")
    next_pid <- {:message, message, loop_count}

    message_loop(next_pid)
  end

benjamintanweihao

#!/bin/bash

set -ex

BUILD_ENV=$1

rm -Rf public
mkdir -p public/styles

function bower_components() {

benjamintanweihao

defmodule Chat.Client do
  # In all of the following functions 'server' stands for the server's pid
  def join(server) do
    send server, :join
  end

  def say(server, message) do
    send server, { :say, message }
  end

benjamintanweihao

Deploy Rails app to digitalocean with nginx, unicorn, capistrano & postgres

Create droplet of your liking (ubuntu 12.10 x32)

ssh to root in terminal with your server ip

ssh root@123.123.123.123

Add ssh fingerprint and enter password provided in email

benjamintanweihao

Capybara

save_and_open_page

Matchers

have_button(locator)

benjamintanweihao

The MONGOID Cheat Sheet

( Source: the mongoid cheatsheet )

Example

  class User

include Mongoid::Document