I tried to get it in the traditional way: [:a, :b, :c, :d][2] however I get the following error:
** (ArgumentError) the Access calls for keywords expect the key to be an atom, got: 2
(elixir) lib/access.ex:255: Access.fetch/2
(elixir) lib/access.ex:269: Access.get/3
Elixir is not an object-oriented language, so the Enum module has only three functions that allow you to access an element of an array based on its index:
iex > Enum.at([:a, :b, :c, :d], 2)
:c
iex > Enum.fetch([:a, :b, :c, :d], 2)
{ :ok, :c }
iex > Enum.fetch!([:a, :b, :c, :d], 2)
{ :ok, :c }
If you try to access indices that do not exist, you will have a different result for each function:
iex > Enum.at([:a, :b, :c, :d], 9999)
nil
iex > Enum.fetch([:a, :b, :c, :d], 9999)
:error
iex > Enum.fetch!([:a, :b, :c, :d], 9999)
** (Enum.OutOfBoundsError) out of bounds error
(elixir) lib/enum.ex:722: Enum.fetch!/2
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