joshnuss

defmodule BTree do
  defstruct tree: nil
  
  def new(e), do: %BTree{tree: {e, nil, nil}}

  def insert(%BTree{tree: root}, element) do
    %BTree{tree: do_insert(root, element)}
  end

  defp do_insert(nil, element) do

joshnuss

defmodule Enum2 do
  import Enum

  def sample(collection),
    do: hd(sample(collection, 1))

  # http://en.wikipedia.org/wiki/Reservoir_sampling
  def sample(collection, count) do
    results = take(collection, count)