Identifier.uniq constructor

Identifier.uniq()

Generates an alphanumeric string of length 16 used to uniquely identify an object.

The string is compounded by two parts:

• The first part represents the microseconds since the 'Unix epoch' from the time it was generated converted to radix 36.
• The second part is randomly generated numbers of radix 36.

The first part of the string can have the maximum length of 11, thus the randomly-generated part is at least 5 characters long.

Implementation

factory Identifier.uniq() {
  final time = DateTime.now().microsecondsSinceEpoch.toRadixString(36);
  final extraChars = 16 - time.length;
  final maxRadix = 36; // 10 numbers and 23 letters.

  var random = Random.secure();

  var randomBitsBuffer = StringBuffer(time)
    ..writeAll(
      List.generate(
        extraChars,
        (idx) => random.nextInt(maxRadix).toRadixString(maxRadix),
      ),
    );

  return Identifier._(randomBitsBuffer.toString());
}