mgwidmann

angular.module('utils.watcher_hider', [])

.service 'WatcherHider', ['$log', ($log)->
  ($scope)->
    @scope = $scope

    # Don't try this at home kids...
    listeners = []
    watches = []
    @$watch = (name_or_fn, watcher_fn)=>

mgwidmann

module ElmDemo where

import Graphics.Element exposing (..)
import Graphics.Collage exposing (..)
import Color exposing (..)
import Time
import Text
import Window

-- MODEL

mgwidmann

module ElmDemo where

import Graphics.Element exposing (..)
import Graphics.Collage exposing (..)
import Color exposing (..)
import Time
import Text
import Window

-- MODEL

mgwidmann

module ElmDemoRefactored where

import Graphics.Element exposing (..)
import Graphics.Collage exposing (..)
import Color exposing (..)
import Time
import Text
import Window

-- MODEL

mgwidmann

# machine 1
# start up with `iex --name m1@127.0.0.1 --cookie greeter`
# This isn't really necessary but it won't hurt anything
Node.connect :"m1@127.0.0.1"

# All `Node.connect/1` calls can go to the same machine and every machine 
# in the cluster will automatically be connected.

# machine 2
# start up with `iex --name m2@127.0.0.1 --cookie greeter`

mgwidmann

# Lets create a bartender in the same way you would in a imperative language.
defmodule Bartender do
  def serve(user, drink) do
    if user.age >= 21 do
      IO.puts "The bartender slides #{user.name} a #{drink}."
    else
      IO.puts "Sorry #{user.name}, you'll have to wait #{21 - user.age} more year(s)."
    end
  end
end

mgwidmann

# The Elixir language is very extensible to allow for future additions or
# third party developers to take the language in directions that the original
# authors could not predict.
# 
# Lets start with understanding what an Elixir macro is
iex> quote do
...>   1 + 1
...> end
{:+, [context: Elixir, import: Kernel], [1, 1]}

mgwidmann

# To show hot code uploading, we first need to build a simple phoenix project so we can see it happen in real time.

# Start by making a new phoenix project
$ mix phoenix.new hotcode

# Go into the directory
$ cd hotcode

# Add exrm dependency to mix.exs file
{:exrm, "~> 1.0.3"}

mgwidmann

# The golden trinity of Erlang is the secret sauce behind what makes
# Elixir a strong choice for any backend application and/or system.

# https://tkowal.wordpress.com/2015/10/20/failing-fast-and-slow-in-erlang-and-elixir/

# The supervision and worker system, commonly referred to as OTP (Open
# Telecom Platform, which has nothing to do with telephony), is what
# gives Erlang/Elixir applications them a robust "self-healing" type
# property that makes them extremely fault tolerant.

mgwidmann

# Elixir has lazily evaluated enumerable objects that allow you
# to work with enumerable objects like lists either only as needed
# or infinitely.

# Start up iex to play around
$ iex

# Typical enumeration is done eagerly where the result is computed ASAP
iex> Enum.map(1..10, fn i -> i * 2 end)
[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]