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

Try this to remove nil

hash = { a: true, b: false, c: nil }
=> {:a=>true, :b=>false, :c=>nil}
hash.inject({}){|c, (k, v)| c[k] = v unless v.nil?; c}
=> {:a=>true, :b=>false}