Removing all empty elements from a hash / YAML?

Question

How would I go about removing all empty elements (empty list items) from a nested Hash or YAML file?

Answer 1

Here is something I have:

# recursively remove empty keys (hashes), values (array), hashes and arrays from hash or array
def sanitize data
  case data
  when Array
    data.delete_if { |value| res = sanitize(value); res.blank? }
  when Hash
    data.delete_if { |_, value| res = sanitize(value); res.blank? }
  end
  data.blank? ? nil : data
end