A Brief Introduction to Elixir

Lightning talk presented in DaWanda

Transcript

1. Iuri Fernandes A Brief Introduction to Elixir
2. Elixir! • Runs on Erlang VM • Cool language • But before…
3. The problem • Telecommunications • Fast • Fault tolerant • Distributed
4. Erlang and Telecom • Designed for telecom problems • OTP(Open Telecom Platform)
5. Slide from José Valim’s presentations
6. Slide from José Valim’s presentations
7. BEAM • Erlang VM • Processes are units of computation • Message passing FTW
8. Image from “Learn you some Erlang for great good” licensed under Creative Commons Messages
9. OTP • Framework • Concurrent and distributed applications • Models behaviors for processes • And much more …
10. OTP Examples Image from “Learn you some Erlang for great good” licensed under Creative Commons
11. Image from “Learn you some Erlang for great good” licensed under Creative Commons OTP Examples
12. Image from “Learn you some Erlang for great good” licensed under Creative Commons OTP Examples
13. Elixir • Created in 2012 by José Valim • Functional (Immutability) • Dynamically typed • Metaprogramming • Fresh life to Erlang ecosystem • BEAM VM
14. Drops of Elixir defmodule MyModule do def increment(argument) do argument + 1 end end defmodule PatternMatching do def head([]), do: nil def head([head | _]), do: head end
15. Drops of Elixir defmodule MyModule do def increment(x) when is_integer(x) do x + 1 end end defmodule PatternMatching do def head([]), do: nil def head([head | _]), do: head end
16. Drops of Elixir parent = self() # Spawns an Elixir process (not an operating system one!) spawn_link(fn -> send parent, {:msg, "hello world"} end) # Block until the message is received receive do {:msg, contents} -> IO.puts contents end
17. Drops of Elixir defmodule Stack do use GenServer # Callbacks def handle_call(:pop, _from, [h|t]) do {:reply, h, t} end def handle_cast({:push, item}, state) do {:noreply, [item|state]} end end
18. Drops of Elixir # Start the server {:ok, pid} = GenServer.start_link(Stack, [:hello]) # This is the client GenServer.call(pid, :pop) #=> :hello GenServer.cast(pid, {:push, :world}) #=> :ok GenServer.call(pid, :pop) #=> :world
19. Applications • Chat web app with Phoenix • Embedded systems with Nerves • Pusher app replacement with Poxa
20. https://github.com/doomspork/elixir-companies Who uses it
23. Questions?