Find key/value pairs deep inside a hash containing an arbitrary number of nested hashes and arrays

Question

A web service is returning a hash that contains an unknown number of nested hashes, some of which contain an array, which in turn contains an unknown number of nested hashes

Answer 1

Ruby 2.3 introduces Hash#dig, which allows you to do:

h = { foo: {bar: {baz: 1}}}

h.dig(:foo, :bar, :baz)           #=> 1
h.dig(:foo, :zot)                 #=> nil