Factorial in Elixir

Welcome to the Factorial in Elixir page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

defmodule Factorial do
  def main(args) do
    args
    |> List.first
    |> as_integer
    |> get
    |> IO.puts()
  end

  def get(0, acc) do
    acc
  end

  def get(n, acc) do
    get(n - 1, acc * n)
  end

  def get(n) when not is_integer(n) or n < 0 do
    "Usage: please input a non-negative integer"
  end

  def get(n) do
    get(n, 1)
  end

  def as_integer(n) do
    try do
        String.to_integer(n)
    rescue
        ArgumentError -> -1
    end
  end
end

Factorial.main(System.argv())

Factorial in Elixir was written by:

• Jeremy Grifski
• Parker Johansen
• pearl2201

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

No 'How to Implement the Solution' section available. Please consider contributing.

How to Run the Solution

No 'How to Run the Solution' section available. Please consider contributing.