import 'dart:math'; final Map daysOfWeek = { 1: 'Mon', 2: 'Tue', 3: 'Wed', 4: 'Thu', 5: 'Fri', 6: 'Sat', 7: 'Sun', }; int randBetween(int min, int max) { return Random().nextInt(max - min) + min; } String formatNumber(int number) { return number.toString().replaceAllMapped( RegExp(r'(\d{1,3})(?=(\d{3})+(?!\d))'), (Match m) => '${m[1]},', ); }