Split duration to string

main.dart

void main() {
  final Duration duration = Duration(hours: 12, minutes: 34, seconds: 56);
  print(duration.splitToString(':'));
}

extension SplitDurationExtension on Duration {
  String splitToString(
    String divider, {
    bool shouldPadLeft = false,
    String padWith = '0',
  }) {
    final int hour = this.inHours;
    final int minute = this.inMinutes - Duration(hours: hour).inMinutes;
    final int second =
        this.inSeconds - Duration(hours: hour, minutes: minute).inSeconds;
    final String result =
        '${shouldPadLeft ? hour.toString().padLeft(2, padWith) : hour}$divider'
        '${shouldPadLeft ? minute.toString().padLeft(2, padWith) : minute}$divider'
        '${shouldPadLeft ? second.toString().padLeft(2, padWith) : second}';
    return result;
  }
}