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

Could be done with facets library (a missing features from standard library), like that:

require 'hash/compact'
require 'enumerable/recursively'
hash.recursively { |v| v.compact! }

Works with any Enumerable (including Array, Hash).

Look how recursively method is implemented.