Arjan van der Gaag @avdgaag • arjanvandergaag.nl 

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– 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. 

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] 

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" 

defmodule MyMap do ! ! ! ! ! end Pattern matching ! def map([], _), do: [] ! ! ! def map([head | tail], fun) do [fun.(head) | map(tail, fun)] end 

Pipelines iex> String.last(String.upcase("foo")) "O" iex> "foo" ...> |> String.upcase ...> |> String.last "O" 

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 

Macros for
 Metaprogramming
 Mayhem 

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 

encapsulated
 state message message 

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Re-learn programming 

Practice makes perfect 

Pure functions and immutable data are easy to test. 

FP OOP 

♥ docs 

Macros allow awesome metaprogramming 

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