MathHelpers

##MY OLD THINKING APPROACH

defmodule MathHelpers do
  def average(values) do
    unless Enum.empty?(values), do: Enum.sum(values) / Enum.count(values)
  end
end

##PATTERN MATCHING APPROACH

defmodule MathHelpers do
  def average([]), do: nil
  def average(values), do: Enum.sum(values) / Enum.count(values)
end

values = [5,5,5,6,6,6]
#values = []
IO.puts MathHelpers.average(values)

@alanpeabody... this doesn't work yet, but is this on the right path

defmodule MathHelpers do
  def average(values), do: Enum.empty?(values)
  def average(values), do: Enum.sum(values) / Enum.count(values)
end

Close!

  def average([]), do: 0
  def average(values), do: Enum.sum(values) / Enum.count(values)

nice. thanks