How to add space between numbers?-CodePudding

Tell me how to split the number of spaces that appear between the numbers (1 000, 1 000 000, etc.). I understandis that this should happen in a row and reverse it. then break the glue and turn over again. I just managed to expand. I can't figure out how to break it down. Or maybe there are some methods in the dart format like in others? In internet there are a lot of decisions for javascript or other languages wich have Format methods. But i didn't find something for Dart.

  void main(List<String> args) {
  var num = 123456789;

  var num1 = (num.toString()).split('').reversed.join();


  print(num1);
}

CodePudding user response：

For formatting and localisation of currencies or quotes, prices and digits checkout intl package and NumberFormat class, because I assume this is what you want to achieve. Different countries have different approaches for displaying numbers.

Also here you have nice solution that works.

CodePudding user response：

You should use regex to find three-digits and separate by a single space(' '). Here is an extension function (plus a working sample) to do that on any string containing numbers:

extension StringNumberExtension on String {
  String spaceSeparateNumbers() {
    final result = this.replaceAllMapped(
        RegExp(r'(\d{1,3})(?=(\d{3}) (?!\d))'), (Match m) => '${m[1]} ');
    return result;
  }
}

void main() async {
  print(
      'this is a number: 12345678901234567890123456789'.spaceSeparateNumbers());
}