Safe access of a nested hash from JSON in Ruby.

safe_json.rb

require 'json'

class Hash
  def dig(*path)
    path.inject(self) do |location, key|
      location.respond_to?(:keys) ? location[key] : nil
    end
  end
end

x = JSON.parse('{ "foo": [1, 2, 3, 4] }')
puts x.dig("foo").inspect
puts x.dig("nonsense", "bar").inspect