Custom Sigils In Elixir

You can create custom sigils by following the sigil_{character} definition pattern. Let's make an addition sigil sigil_a that sums up space separated numbers.

defmodule CustomSigil do
  def sigil_a(string, []) do
    string
    |> String.split(" ")
    |> Enum.map(& String.to_integer(&1))
    |> Enum.sum()
  end
end

# ~a(2 4 6)
#=> 12
# ~a(12 12)
#=> 24