Elixir Mini Introduction for Zürich Meetup

Transcript

1. Elixir Stefan Wintermeyer @wintermeyer

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)

3. defmodule ModuleName do def hello do IO.puts "Hello World" end

   end http://elixir-lang.org/crash-course.html

4. IEx Elixir’s interactive shell

5. None

6. Why would I want to learn Elixir? Why invest the

   time and effort? I’m happy with Ruby and OO.

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

   them.

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

9. 2. Stability Speed is nothing without stability.

10. 3. Hot-Code Upgrades Zero Downtime!

11. Some Code Examples

12. Assigning Values to Variables

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

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

    iex(3)>

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

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

16. Tuples

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

    30} iex(2)>

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

    30} iex(2)> a 10 iex(3)>

19. Pattern Matching

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

    30} iex(2)>

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)>

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}

23. If you want to get your feed wet with Elixir

    I recommend two projects.

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

25. None

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

27. None

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

29. None

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

31. Thank you! @wintermeyer