Clojure get_in in ruby

get_in.rb

# Returns value from hash based on the path
#
# @param hash [Hash] - hash to retrieve values from
# @param path [Array] - non-empty array representing recursive path
#
# @returns [Object] - an object located within an array on the given path
#
# Examples:
#
#    get_in({:a => {:b => {:c => 2}}}, [:a, :b, :c]) # => 2
#    get_in({:a => {:b => {:c => 2}}}, [:a, :e, :c]) # => nil
#    get_in({:a => {:b => {:c => 2}}}, [:a, :b])     # => {:c=>2}
#
def get_in(hash, path)
  raise "Path should be an array!" unless path.is_a?(Array)
  raise "Path should not be empty!" if path.empty?

  res = hash.fetch(path.shift, nil)
  if path.empty? || res.nil?
    res
  else
    get_in(res, path)
  end
end # get_in(hash)