alpha static method
Implementation
static String alpha(int length, {bool includeUppercase = false}) {
const lowercase = 'abcdefghijklmnopqrstuvwxyz';
const uppercase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
final chars = includeUppercase ? (lowercase + uppercase) : lowercase;
final rand = math.Random();
return List.generate(length, (_) => chars[rand.nextInt(chars.length)]).join('');
}