Elixir Mini Introduction for Zürich Meetup

Transcript

1. Elixir
   Stefan Wintermeyer
   @wintermeyer
   

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2. Elixir is a functional, concurrent,
   general-purpose programming
   language that runs on the Erlang
   virtual machine (BEAM).
   https://en.wikipedia.org/wiki/Elixir_(programming_language)
   

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3. defmodule ModuleName do
   def hello do
   IO.puts "Hello World"
   end
   end
   http://elixir-lang.org/crash-course.html
   

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4. IEx
   Elixir’s interactive shell
   

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6. Why would I want to
   learn Elixir?
   Why invest the time and effort? I’m happy with Ruby and OO.
   

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7. Three Main Reasons
   Spoiler Alert: Concurrency is not one of them.
   

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8. 1. Speed
   Elixir runs circles around Ruby and Python.
   

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9. 2. Stability
   Speed is nothing without stability.
   

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10. 3. Hot-Code Upgrades
    Zero Downtime!
    

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11. Some Code Examples
    

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12. Assigning Values to
    Variables
    

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13. iex(1)> a = 1
    1
    iex(2)>
    

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14. iex(1)> a = 1
    1
    iex(2)> a = 2
    2
    iex(3)>
    

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15. iex(1)> a = 1
    1
    iex(2)> a = 2
    2
    iex(3)> ^a = 3
    ** (MatchError) no match of right hand
    side value: 3
    

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16. Tuples
    

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17. iex(1)> {a, b, c} = {10, 20, 30}
    {10, 20, 30}
    iex(2)>
    

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18. iex(1)> {a, b, c} = {10, 20, 30}
    {10, 20, 30}
    iex(2)> a
    10
    iex(3)>
    

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19. Pattern Matching
    

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20. iex(1)> {a, b, c} = {10, 20, 30}
    {10, 20, 30}
    iex(2)>
    

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21. iex(1)> {a, b, c} = {10, 20, 30}
    {10, 20, 30}
    iex(2)> {a, 20, c} = {10, 20, 30}
    {10, 20, 30}
    iex(3)>
    

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22. iex(1)> {a, b, c} = {10, 20, 30}
    {10, 20, 30}
    iex(2)> {a, 20, c} = {10, 20, 30}
    {10, 20, 30}
    iex(3)> {a, 1, c} = {10, 20, 30}
    ** (MatchError) no match of right hand
    side value: {10, 20, 30}
    

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23. If you want to get your
    feed wet with Elixir I
    recommend two projects.
    

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24. If you like hardware try
    http://nerves-project.org
    

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26. If you like the web try
    www.phoenixframework.org
    

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28. Phoenix Framework
    Productive. Reliable. Fast.
    Phoenix != Rails
    

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30. mix phoenix.new blog
    Y
    cd blog
    vim config/dev.exs
    brew install postgres
    brew services start postgres
    createuser -W --createdb blog
    demo
    mix ecto.create
    mix phoenix.gen.html Post posts subject body
    vim web/router.ex
    resources "/posts", PostController
    mix ecto.migrate
    mix phoenix.server
    Blog Example
    

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31. Thank you!
    @wintermeyer
    

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