aoc-2018/2.exs

{:ok, content} = File.read("input-2")
content = content
|> String.split("\n", trim: true)
|> Enum.map(fn n -> String.graphemes(n) end)

count2 = 0
count3 = 0
sum2 = for line <- content do
	Enum.reduce(line, %{}, fn char, acc -> 
		Map.put(acc, char, (acc[char] || 0)+ 1)
	end)
  |> Map.values 
end


sum3 = for sum <- sum2 do
       Enum.filter(sum, fn x -> x == 3 end) # need to split and count occurance of 2 and 3 seperately
       |> (fn x -> [ 0 | x] end).() #so the accumulator starts with 0
       |> Enum.reduce(fn _, acc -> acc + 1 end) #if x == 2 do acc + 1 end end)
end

sum3= sum3
|> Enum.sum
|> IO.inspect 

sum2 = sum2 
       |> Enum.filter(fn x -> Enum.member?(x, 2) end)# need to split and count occurance of 2 and 3 seperately
       |> (fn x -> [ 0 | x] end).() #so the accumulator starts with 0
       |> Enum.reduce(fn _, acc -> acc + 1 end) #if x == 2 do acc + 1 end end)

sum2 = sum2
|> IO.inspect

sum1 = sum3 * sum2
IO.puts(sum1)
#IO.puts(count2)
#IO.puts(count3)

# File.stream!("input-2")
# |> Stream.map(&String.trim/1)
# |> Stream.map(fn n -> String.graphemes(n) end)
# |> Enum.reduce(%{}, fn char, acc ->
#       Map.update(acc, char, 1, &(&1 + 1)) 
#     end)
# |> IO.puts