Hi,
I am wondering why my solution wil not work

1. source: Perfect Numbers in Elixir on Exercism

2. solution attempt:

  @spec classify(number :: integer) :: {:ok, atom} | {:error, String.t()}
  def classify(number) do
    case aliquot_sum(number) do
      number -> ok(:perfect)
      x when x > number -> ok(:abundant)
      x when x < number -> ok(:deficient)
    end
  end

  defp ok(item), do: {:ok, item}
  defp aliquot_sum(number), do: get_divisors(number) |> Enum.sum()

  defp get_divisors(number, divisor \\ 1, acc \\ [])
  defp get_divisors(number, divisor, acc) when divisor > div(number,2), do: acc
  defp get_divisors(number, divisor, acc) when rem(number, divisor) == 0,
    do: get_divisors(number, divisor + 1, [divisor | acc])
  defp get_divisors(number, divisor, acc), do: get_divisors(number, divisor + 1, acc)
end

3. question:

Complier is saying:

this clause cannot match because a previous clause at line 15
always matchesElixir
perfect_numbers.ex(15, 7): related

and

variable "number" is unused (there is a variable with the same name in the
context, use the pin operator (^) to match on it or prefix this variable 
with underscore if it is not meant to be used)Elixir

image656×162 9.21 KB

Why is that, why it cannot match with number passed to function?