ruby - iterate over every key in nested hash -

is there simple way iterate on every key in nested hash. have large json , want values of keys, no matter level at. doesn't matter parent is. looking way straight line iterate though each key , return values of keys equal specific string.

module hashnestedget   refine hash     def nested_get(key)       return fetch(key) if has_key?(key)       each |subkey, subval|         if hash === subval           result = subval.nested_get(key)           return result if result         end       end       nil             end   end end  = { b: 1, c: { d: { e: 2 } } } using hashnestedget require 'pp' pp a.nested_get(:b) # => 1 pp a.nested_get(:e) # => 2 pp a.nested_get(:d) # => nil 

(posted refinement, won't work in irb; easy enough make plain function if necessary)