joshnuss

defmodule MigrationRunner do
  use GenServer.Behaviour

  @server_name :migration_runner
  @full_name {:local, @server_name}

  def start_link do
    :gen_server.start_link(@full_name, __MODULE__, nil, [])
  end

joshnuss

module AttributeKeyWriter
  extend ActiveSupport::Concern

  module ClassMethods
    protected
      # Allow writing an attribute by key/code
      #
      # Example:
      #   belongs_to :currency
      #   attr_key_writer(:currency, key: "code")

joshnuss

=begin
  White Noise Generator
  http://en.wikipedia.org/wiki/White_noise

  Generates a .wav file with random noise.
  Copy to phone, and run on loop.

  `gem install wavefile`
=end

joshnuss

" put this .vimrc in your project's root folder

" type ,t to run all tests
map <Leader>t :!mix test<CR>

" type ,e to run current test
map <Leader>e :!mix test %<CR>

joshnuss

# usage:
#
# iex> CreditCard.type(%{number: "4242424242424242"})
# => :visa 

defmodule CreditCard do
  defstruct [:number, :expiration, :cvc]

  # find the type of a credit card
  # attempt map for first character, first 2 characters, etc (up to 4 characters)

joshnuss

# XML Builder - inspired by jimweirich's ruby builder
defmodule Builder do
  def xml(elements) when is_list(elements),
    do: Enum.map_join(elements, &xml/1)

  def xml(element_name) when is_atom(element_name) or is_bitstring(element_name),
    do: xml({element_name})

  def xml({element_name}),
    do: "<#{element_name}/>"

joshnuss

# defines a generic proxy
defmodule GenProxy do
  defmacro __using__(_) do
    quote location: :keep do
      use GenServer

      def handle_call(msg, from={_process, ref}, state) do
        case proxy_call(msg, from, state) do
          {:forward, server, new_state} ->
            :erlang.send(server, {:"$gen_call", {self, ref}, msg}, [:noconnect])

joshnuss

defmodule Enum2 do
  import Enum

  def sample(collection),
    do: hd(sample(collection, 1))

  # http://en.wikipedia.org/wiki/Reservoir_sampling
  def sample(collection, count) do
    results = take(collection, count)

joshnuss

// Example Angular.js form built with components (kind of like formtastic)
// `field`: supports text, number, email, checkbox, select, textarea, etc..
// generates label and appropriate field type, withcheckmark/error icon when field is valid/invalid
.well
  h1 Contact

  super-form(name="contactForm" submit="send()")
    field(model="message.email"   type="email"    required autofocus)
    field(model="message.name"    type="text"     required)
    field(model="message.topic"   type="select"   required options="topic as topic for topic in topics")

joshnuss

angular.module('Foo').controller 'ExampleCtrl', ($scope, Flash) ->
  
  $scope.doSomething = ->
    Flash.info "Hello There!"