Elixir

DEVELOPERS CONFERENCE

FUTURE

THE

FOR

DIGITAL WORLD 2017

TAwsif Aqib

ENGINEERING MANAGER

JOSE VALIM

Created Elixir on 2012

Ex-member of Rails Core Team

Platformatec

2 Million concurrent connections in a single machine using Erlang and just 10 developers.

- Whatsapp

https://blog.whatsapp.com/196/1-million-is-so-2011?

Created on 1986

Ericsson Computer Science Lab

Open Telecom Platform (OTP)

Open sourced on 1996

Fault-tolerant

Concurrent

Distributed

Functional

I liked everything I saw in Erlang, but hated the things I didn't see.

- Jose Valim

ERLANG

Problems

Unfriendly Syntax

Unreadable Macros

No Polymorphism

Lack of Web Tools

Elixir

Runs in Erlang Virtual Machine

Can use any Erlang Module without penalty

Best suited for Web Application Development and Embedded System

Elixir is a dynamic, functional language designed for building scalable and maintainable applications.

- elixir-lang.org

USING ELIXIR/Erlang

https://github.com/doomspork/elixir-companies​

Amazon

Yahoo!

Pinterest

Facebook

Heroku

Whatsapp

CouchDB

RabbitMQ

World of Warcraft

Ericsson

Lets write some code

No                                       please ...

"Hello World"

First Project

$ mix new dev_conf
...

First function

defmodule DevConf do
  def factorial(n) do
    if n == 0 do
      1
    else
      DevConf.factorial(n-1) * n
    end
  end
end

Running code

$ iex -S mix
...

iex> DevConf.factorial(1000)
...

elixir style

defmodule DevConf do
  def factorial(0) do
    1
  end

  def factorial(n) do
    DevConf.factorial(n-1) * n
  end
end

performance

iex> DevConf.factorial(1000)
...

iex> DevConf.factorial(10000)
...

iex> DevConf.factorial(100000)
...

DISTRIBUTED SYSTEM

COMMUNICATION AMONG DISTRIBUTED APPS

$ iex --sname node_1

$ iex --sname node_2

Node 1

Node 2

$ iex --sname node_1

iex> Node.list
[]

$ iex --sname node_2

iex> Node.connect(:node_2@host)
true

iex> Node.list
[:node_1@hostname]

Node 1

Node 2

iex> defmodule DevConf do
iex> def say_hello() do
iex> "Hello Developers"
iex> end
iex> end
...

iex> Node.spawn_link(:node_1@host, fn () -> 
IO.puts DevConf.say_hello()
end)

"Hello Developers"
#PID<9785.108.0>

Node 1

Node 2

THE FUTURE

The future will be functional and concurrent.

IoT

Realtime

Concurrency

Microservice

Distributed System

popular Tags

 (REALTIME)

Channels

defmodule DevConf.TalkChannel do
  use Phoenix.Channel

  def join("talk", _payload, socket) do
    {:ok, socket}
  end

  def handle_in("message:new", payload, socket) do
    broadcast! socket, "message:new", %{user: payload["user"],  
                                      message: payload["message"]}
    {:noreply, socket}
  end

end

 (MICROSERVICE)

UMBREALLA PROJECT

$ mix new dev_conf --umbrella

dev_conf
├── README.md
├── apps
├── config
│   └── config.exs
└── mix.exs

 (CONCURRENCY)

ELIXIR PROCESS

defmodule DevConf.TableTennis do

  def greet do
    receive do
      :hello ->
        IO.puts "Hello Alchemist"
    end
    greet()
  end

end

 (IoT)

NERVES

Craft and deploy bulletproof embedded software in Elixir

Hardware Support

Production in huge scale

Well written libraries

http://nerves-project.org/​

 (Distributed System)

OTP

State Management

Application Discovery

Failure Detection

Hot Code Swapping

Community

3000+
Elixir Forum Treads

17,415
Slack User

Registered

4,963
Stack Overflow

Question

Backed by Ruby, Erlang and Node.js community

Packages (HEx)

540,625
Downloads
Yesterday

5,539
Packages
Available

157,370,966

All Time Downloads

https://hex.pm

Phoenix Framework

Web Framework

Rails inspired

Developer Friendly

Super Fast (Microseconds)

Lots of Resources

Context (version 1.3)

http://phoenixframework.org/

WHERE to use elixir?

https://www.manning.com/books/elixir-in-action

Comparison of Technologies

WHERE to use elixir?

When you need

Clean, Readable Syntax

Mature Tooling (30 years)

Built-in Unit Testing

Meta-programming

Built-in Documentation

Distributed System

Concurrency

Fault-tolerant

High Availability

Choose Elixir for the code,

not the performance.

REsources

Website
elixir-lang.org
elixirforum.com
elixirschool.com

Books
pragprog.com/book/elixir/programming-elixir
pragprog.com/book/phoenix/programming-phoenix

Screencasts
dailydrip.com
elixirsips.com

github.com/h4cc/awesome-elixir​

Most Important Link

Questions

GIVEAWAY

Thanks