Ejemplo: Suma de los elementos de una lista

• [~/src_elixir]$ pwd -P
  /Users/casiano/Google Drive/src/elixir
  

• gist

[~/Google Drive/src/elixir]$ cat sum.elixir 
defmodule MyList do
  def sum([]), do: 0
  def sum([ head | tail ]), do: head + sum(tail)
end
IO.puts MyList.sum [1, 2, 3, 4]

[~/Google Drive/src/elixir]$ elixir sum.elixir 
/Users/casiano/Google Drive/src/elixir/sum.elixir:1: redefining module MyList
10

[~/src_elixir]$ iex
Erlang R16B (erts-5.10.1) [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]

Interactive Elixir (0.12.0) - press Ctrl+C to exit (type h() ENTER for help)
iex(1)> c("sum.elixir")
sum.elixir:1: redefining module MyList
10
[MyList]
iex(2)> MyList.sum [1, 2, 3, 4, 5]
15
iex(3)>

Es posible escribir un módulo en la consola:

iex(3)> defmodule MyModule do
...(3)>   def hello do
...(3)>     IO.puts "Another Hello"
...(3)>   end
...(3)> end
{:module, MyModule,
 <<70, 79, 82, 49, 0, 0, 7, 104, 66, 69, 65, 77, 65, 116, 111, 109, 0, 0, 0, 124, 0, 0, 0, 13, 15, 69, 108, 105, 120, 105, 114, 46, 77, 121, 77, 111, 100, 117, 108, 101, 8, 95, 95, 105, 110, 102, 111, 95, 95, 4, ...>>,
 {:hello, 0}}
iex(4)> MyModule.hello
Another Hello
:ok