Efficient way to filter a Map by value in Elixir

Question

In Elixir, what would be an efficient way to filter a Map by its values.

Right now I have the following solution

%{foo: \"bar\", biz: ni         


        

Answer 1

You can also write like this:

m = %{foo: "bar", biz: nil, baz: 4}

Enum.reduce(m, m, fn 
  {key, nil}, acc -> Map.delete(acc, key)
  {_, _}, acc -> acc
end)

The code above is quite efficient if there are few nil values in m.