Binary Gap

Elixir Binary Gap

defmodule BinaryGap do
  def binary_gap(n) do
    n
    |> Integer.to_string(2)
    |> String.trim("0")
    |> String.split("1")
    |> Enum.map(&String.length/1)
    |> Enum.max()
  end
end

This turns the number into binary, ignores zeroes outside the edges, and finds the longest run of zeroes between 1s.