Silly.coin_toss

You're seeing just the function coin_toss, go back to Silly module for more information.

return true or false, at about equal probability

100 coin flips should contain both a true AND a false value

iex> Enum.member?(Enum.map(1..100, fn _ -> Silly.coin_toss() end), true)
true
iex> Enum.member?(Enum.map(1..100, fn _ -> Silly.coin_toss() end), false)
true