Elixir - Looping through and adding to map

Question

I\'m rebuilding something in Elixir from some code I built in C#.

It was pretty hacked together, but works perfectly (although not on Linux, hence rebuild).

Answer 1

This might help too:

count_animals_in_area = fn (area, acc) ->
  acc = case Map.has_key?(area, "duck") do
          true ->
            Map.put(acc, "ducks", (acc["ducks"] + area["duck"]))
          false ->
            acc
        end

  acc = case Map.has_key?(area, "goose") do
          true ->
            Map.put(acc, "geese", (acc["geese"] + area["goose"]))
          false ->
            acc
        end

  acc = case Map.has_key?(area, "cat") do
          true -> 
            Map.put(acc, "cats", (acc["cats"] + area["cat"]))
          false ->
            acc
        end

  acc
end

count_animals_in_areas = fn(areas) ->
  acc = %{ "ducks" => 0,
           "geese" => 0,
           "cats" => 0 }
  IO.inspect Enum.reduce areas, acc, count_animals_in_area
end

t1 = [ %{"duck" => 3, "goose" => 4, "cat" => 1},
       %{"duck" => 7, "goose" => 2},
       %{"goose" => 12}]

IO.puts "JEA: begin"
count_animals_in_areas.(t1)
IO.puts "JEA: end"

Output:

iex(31)> c "count_animals.exs"
JEA: begin
%{"cats" => 1, "ducks" => 10, "geese" => 18}
JEA: end
[]

I am just learning Elixir so the above is undoubtedly suboptimal, but, hopefully slightly informative.