Dart#randomEmoji

random_emoji.dart

import 'dart:math';

void main() async {
  print(_randomEmoji());
}

String _randomEmoji() {
  final emojis = _emojis();
  return emojis[Random().nextInt(emojis.length - 1)];
}

List<String> _emojis() {
  return _range().map((e) => String.fromCharCode(e)).toList();
}

Iterable<int> _range() sync* {
  const start = 0x1F601;
  const stop = 0x1F64F;

  for (int value = start; value < stop; value += 1) {
    yield value;
  }
}