dart string split with maximum

main.dart

import 'dart:convert';

List<String> split(String string, String separator, {int max = 0}) {
  var result = List<String>();

  if (separator.isEmpty) {
    result.add(string);
    return result;
  }

  while (true) {
    var index = string.indexOf(separator, 0);
    if (index == -1 || (max > 0 && result.length >= max)) {
      result.add(string);
      break;
    }

    result.add(string.substring(0, index));
    string = string.substring(index + separator.length);
  }

  return result;
}

void main() {
  print(json.encode(split("a=b=c", "="))); // ["a","b","c"]
  print(json.encode(split("a=b=c", "=", max: 1))); // ["a","b=c"]
  print(json.encode(split("", ""))); // [""]
  print(json.encode(split("foo", ""))); // ["foo"]
  print(json.encode(split("foo", "foo"))); // ["",""]
  print(json.encode(split("a=", "="))); // ["a",""]
}

link to dartpad.dev -> https://dartpad.dev/e9a5a8a5ff803092c76a26d6721bfaf4
stackoverflow answer -> Flutter/Dart: Split string by first occurrence