generate a random number dart code example

Example 1: create random string with numbers dart

import 'dart:math';

void main() {
  print(getRandomString(5));  // 5GKjb
  print(getRandomString(10)); // LZrJOTBNGA
  print(getRandomString(15)); // PqokAO1BQBHyJVK
}

import 'dart:math';

String generateRandomString(int len) {
  var r = Random();
  const _chars = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz1234567890';
  return List.generate(len, (index) => _chars[r.nextInt(_chars.length)]).join();
}

Example 2: generate random int dart

import 'dart:math';

var now = new DateTime.now();
Random rnd = new Random();
Random rnd2 = new Random(now.millisecondsSinceEpoch);

void main() {
  int min = 13, max = 42;
  int r = min + rnd.nextInt(max - min);
  print("$r is in the range of $min and $max"); // e.g. 31
  // used as a function nextInter:
  print("${nextInter(min, max)}"); // for example: 17

 int r2 = min + rnd2.nextInt(max - min); ...