Elixir -> Count # of commas in lines in a file

num_commas_in_lines.exs

# NOT idiomatic code.. just threw this together
# the need to unfold the stream for codepoints feels icky
# Plus not mapping counts across all lines, doing Enum.at! YUCK!

temp = File.stream!("path/to/file")
tempx = Enum.map(temp, fn line -> Stream.unfold(line, &String.next_codepoint/1) end) 
tempy = Enum.map(tempx, fn line -> Enum.filter(line, fn x -> x == "," end) end)
Enum.count(Enum.at(tempy, 0))