code: func (f ZoneTypeFilter) Match(zone *route53.HostedZone) bool {
  	// An empty zone filter includes all hosted zones.
  	if f.zoneType == "" {
  		return true
  	}
  
  	// If the zone has no config we assume it's a public zone since the config's field
  	// `PrivateZone` is false by default in go.
  	if zone.Config == nil {
  		return f.zoneType == zoneTypePublic
  	}
  
  	// Given a zone type we return true if the given zone matches this type.
  	switch f.zoneType {
  	case zoneTypePublic:
  		return !aws.BoolValue(zone.Config.PrivateZone)
  	case zoneTypePrivate:
  		return aws.BoolValue(zone.Config.PrivateZone)
  	}
  
  	// We return false on any other path, e.g. unknown zone type filter value.
  	return false
  }
docs: // Match checks whether a zone matches the zone type that's filtered for.