elixir_cheatsheat.ex

# NESTED FOR LOOP
def create_deck do
  values = ["Ace", "Two", "Three", "Four", "Five"]
  suits = ["Spades", "Clubs", "Hearts", "Diamonds"]

  # list comprehension.  Basically a .map() function
  for suit <- suits, value <- values do
    "#{value} of #{suit}"
  end
end

comment """ 
output: 
["Ace of Spades", "Two of Spades", "Three of Spades", "Four of Spades",
 "Five of Spades", "Ace of Clubs", "Two of Clubs", "Three of Clubs",
 "Four of Clubs", "Five of Clubs", "Ace of Hearts", "Two of Hearts",
 "Three of Hearts", "Four of Hearts", "Five of Hearts", "Ace of Diamonds",
 "Two of Diamonds", "Three of Diamonds", "Four of Diamonds", "Five of Diamonds"]
"""

# CASE STATEMENT (no if), READ/WRITE FILE
def save(deck, filename) do
  binary = :erlang.term_to_binary(deck)
  File.write(filename, binary)
end

def load(filename) do
  {status, binary} = File.read(filename)

  case status do
    :ok -> :erlang.binary_to_term binary
    :error -> "That file does not exist"
  end
end

# compressed version of load/1
def load(filename) do
  case File.read(filename) do
    {:ok, binary} -> :erlang.binary_to_term binary
    {:error, :enoent} -> "That file does not exist"
  end
end