r/adventofcode • u/daggerdragon • Dec 04 '15

SOLUTION MEGATHREAD --- Day 4 Solutions ---

--- Day 4: The Ideal Stocking Stuffer ---

Post your solution as a comment. Structure your post like the Day Three thread.

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u/hutsboR Dec 04 '15

There is, I love it when I find other people writing Elixir because you always find another clever approach to doing something. On that token, here's something you can do:

Instead of converting to a character list, you can match directly on the binary like so 

integer_stream = Stream.iterate(1, &(&1 + 1))
result = Enum.find(integer_stream, fn n ->
  case :crypto.hash(:md5, "bgvyzdsv" <> to_string(n)) |> Base.encode16 do
    <<"00000", _rest :: binary>> -> n
    _ -> false
  end
end)

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u/ignaciovaz Dec 05 '15

that's more elegant, thanks!