Elixir solution for http://www.codewars.com/kata/dont-drink-the-water

liquids.ex

# Elixir solution for http://www.codewars.com/kata/dont-drink-the-water
defmodule Liquids do
  @density %{ ?H => 1.36, ?W => 1.00, ?A => 0.87, ?O => 0.8 }

  def separate_liquids([]), do: []

  def separate_liquids([h|_] = glass) when is_list(h) and length(h) > 0 do
    List.flatten(glass) |> Enum.sort_by(&(@density[&1])) |> Enum.chunk(length(h))
  end
end


# Liquids.separate_liquids([]) == []
# Liquids.separate_liquids([['H', 'H', 'W', 'O'],['W','W','O','W'],['H','H','O','O']]) == ['OOOO', 'WWWW', 'HHHH']
# Liquids.separate_liquids(['HHWO', 'WWOW', 'HHOO']) == ['OOOO', 'WWWW', 'HHHH']
# Liquids.separate_liquids([['A'],['H'],['W'],['O']]) == ['O', 'A', 'W', 'H']
# Liquids.separate_liquids([['A','A','O','H'],['A', 'H', 'W', 'O'],['W','W','A','W'],['H','H','O','O']]) == ['OOOO', 'AAAA', 'WWWW', 'HHHH']