oohhhh, completely missed!! nicely done with the Integer.parse(str)… never thought about splitting numbers vs rest this way
Since this one was pretty much all parsing (again), I made a slightly more robust parser this time
e.g.
defp parse(%{todo: [h | t]} = state) when h in @digits do
state
|> add_to_buffer(h)
|> increment(:x)
|> Map.put(:todo, t)
|> parse()
end
Worked well for both parts. Full solution code here on Github
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+1 for this - it’s my favorite part of AoC.
With “real-world” problems, it usually takes months or years to fully regret an architectural decision - with an AoC problem, all it takes is part 2 
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