Generate Strong Random Password in Dart

import 'dart:math';

void main() {
  print(generatePassword(10));
  print(generatePassword(20));
  print(generatePassword(30));
}
  
String generatePassword(int passLength) {
  String upper = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
  String lower = 'abcdefghijklmnopqrstuvwxyz';
  String numbers = '1234567890';
  String symbols = '!@#\$%^&*()<>,./';
  String seed = upper + lower + numbers + symbols;
  String password = '';
  List list = seed.split('').toList();
  Random rand = Random();

  for (int i = 0; i < passLength; i++) {
    int index = rand.nextInt(list.length);
    password += list[index];
  }
  return password;
}  
  

Output

0A9B55(gxR
A4!!hgp8V%T.i*e9Jvgv
l$4HN)nxw53tgbKC9thiXYAG#WJ>/*