Say Hello to Elixir

Arjan van der Gaag talks about Elixir and how to apply some of the lessons learned to every day OOP with Ruby.

Transcript

1. Arjan van der Gaag @avdgaag • arjanvandergaag.nl
3. – erlang.org Erlang is a programming language used to build massively scalable soft real-time systems with requirements on high availability. Erlang's runtime system has built-in support for concurrency, distribution and fault tolerance.
4. Anonymous functions iex> Enum.map [1, 2, 3], fn n -> n * 2 end [2, 4, 6] iex> Enum.map [1, 2, 3], &(&1 * 2) [2, 4, 6]
5. Named functions & modules defmodule Greeter do def greet(name) do IO.puts "Hello, #{name}" end end iex> Greeter.greet("James") "Hello, James" iex> Enum.each ["john", “paul”], &Greeter.greet/1 "Hello, john" "Hello, paul"
6. defmodule MyMap do ! ! ! ! ! end Pattern matching ! def map([], _), do: [] ! ! ! def map([head | tail], fun) do [fun.(head) | map(tail, fun)] end
7. Pipelines iex> String.last(String.upcase("foo")) "O" iex> "foo" ...> |> String.upcase ...> |> String.last "O"
8. Assert defmodule TruthTest do use ExUnit.Case test "considers two strings equal" do assert "foo" == "bar" end end ! ! ! ! ! ! ! ! 1) test considers two strings equal (TruthTest) ** (ExUnit.ExpectationError) expected: "foo" to be equal to (==): "bar" at test/demo/truth_test.exs:5
9. Macros for
 Metaprogramming
 Mayhem
10. Actors fib = spawn(Fibonacci, :server, [self]) fib <- { :number, 17 } ! ! ! receive do ! ! ! ! ! ! end ! ! ! ! { :ok, result } -> IO.puts "Received response:" IO.puts result ! ! ! ! ! ! ! { _, error } -> IO.puts “An error occured!” IO.puts error
11. encapsulated
 state message message
13. Re-learn programming
14. Practice makes perfect
15. Pure functions and immutable data are easy to test.
16. FP OOP
17. ♥ docs
18. Macros allow awesome metaprogramming
19. Find out more • elixir-lang.org • erlang.org • Programming Elixir (Dave Thomas) • Meet Elixir (Peepcode play-by-play with José Valim) • exercism.io • Gary Bernhardt: Boundaries