Idiomatic way of handling missing Map fields

Questions & Help Questions
,
1

I’m extracting many fields from a map using pattern-matching against the function parameter. Sometimes only a single field is missing from the input map. I’m handling this case with Map.merge-ing a default value into the input map and calling the same function again.

However, this feels not quite idiomatic. Can you maybe think of a more idiomatic way of handling this case?

Example:

defmodule Foobar do
  def foo(%{"a" => a, "b" => b, "c" => c, "d" => d, "e" => e}), do: do_something(a, b, c, d, e)

  def foo(params), do: foo(Map.merge(params, %{"e" => 10}))

  def do_something(a, b, c, d, e), do: IO.inspect("#{a}-#{b}-#{c}-#{d}-#{e}")
end

Foobar.foo(%{"a" => 1, "b" => 2, "c" => 3, "d" => 4, "e" => 5})
Foobar.foo(%{"a" => 1, "b" => 2, "c" => 3, "d" => 4})
```