Compare version name in Dart for DartPad share

main.dart

// to see more: https://stackoverflow.com/a/79051433/5881669
import 'dart:math';
import 'package:collection/collection.dart';

void main() {
  print(compareVersion('1.2.3', '12.3')); // -1
  print(compareVersion('12.3', '1.2.3')); // 1
  print(compareVersion('1.2.3', '1.2.3')); // 0
}

int compareVersion(String version1, String version2) {
  final nums1 = version1.split('.').map(BigInt.parse).toList();
  final nums2 = version2.split('.').map(BigInt.parse).toList();
  // pad with 0 for the shorter list
  if (nums1.length != nums2.length) {
    final diff = nums1.length - nums2.length;
    (diff > 0 ? nums2 : nums1).addAll(List.filled(diff.abs(), BigInt.zero));
  }
  final maxBitLengths = IterableZip([nums1, nums2])
      .map((item) => max(item[0].bitLength, item[1].bitLength))
      .toList();
  final v1Num = nums1.reduceIndexed((i, a, b) => a << maxBitLengths[i] | b);
  final v2Num = nums2.reduceIndexed((i, a, b) => a << maxBitLengths[i] | b);
  return min(max(v1Num.compareTo(v2Num), -1), 1);
}