Ruby > Remove has values recursively

clean_up.rb

event = {
  "level" => 99,
  "msgid" => "97bf040b.ba1078",
  "pid" => 21,
  "source" => "f7d04af7b740/node-red",
  "message" => {
    "res" => {
      "_res" => "[Circular]"
    },
    "payload" => "[Circular]"
  }
}

def clean_up(event)
  if event&.is_a?(Hash)
    event.each_pair do |key, value|
      if value == '[Circular]'
        event.delete(key)
      else
        clean_up(value)
      end
    end
  elsif event&.is_a?(Array)
    event = event.collect { |item| clean_up(item) }
  end
  event
end

clean_up(event)