gistfile1.ex

defmodule Combinations do

  # See http://rosettacode.org/wiki/Combinations#Erlang

  def comb(0, _), do: [[]];

  def comb(_, []), do: [];

  def comb(n, [h | t]) do
    lc = for l <- comb(n - 1, t), do: [h | l]
    lc ++ comb(n, t)
  end
end