Euler1.exs

# less than 1000, multiple of 3 or 5

defmodule Problem1 do

  def solve(limit) do
      1..(limit-1) 
      |> Enum.filter(fn x -> ((rem(x, 3) == 0) || (rem(x, 5) == 0)) end)
      |> Enum.reduce(0, &(&1 + &2))
  end

  def print do
    IO.puts solve(1000)
  end

end

Problem1.print