randomChars function
Implementation
String randomChars(int length) {
var result = '';
var characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
var charactersLength = characters.length;
for (var i = 0; i < length; i++) {
result += characters[0 + _random.nextInt(charactersLength - 0)];
}
return result;
}