I saw examples on how to do kind of similar stuff but never exactly what I want, I'm wondering how to do it properly so if you can give me an hint I would be really happy ! :)

["a","a","b","a","c","c","b","b","b","d","a"] =====> [2,1,1,2,3,1,1]

CodePudding user response：

The basic process will be

void main(List<String> args) {
  final data = ["a", "a", "b", "a", "c", "c", "b", "b", "b", "d", "a"];

  List<int> result = [];

  int c = 1;
  for (int i = 0; i < data.length - 1; i  ) {
    if (data[i] == data[i   1]) {
      c  ;
    } else {
      result.add(c);
      c = 1;
    }
  }
  // we are still missing the count for last element
  /// if last two elements are same update the value
  if (data[data.length - 1] == data[data.length - 2]) {
    result[result.length - 1] = result[result.length - 1]   1;
  }
  //else add 1 for last char
  else {
    result.add(1);
  }
  print(result.toString());
}

CodePudding user response：

I tried to create a new flutter app to test the code, because it doesn't work in pure darts code without flutter. I have used the splitBetween method.

import 'package:collection/collection.dart';

final data = ["a", "a", "b", "a", "c", "c", "b", "b", "b", "d", "a"];

void main() {
  // I put this code here just for testing, 
  var foo = data.splitBetween((a, b) => a != b).map((a) => a.length);
  print(foo);

  runApp(const MyApp()); // Remember that you're inside flutter app.
}

Output in console :

(2, 1, 1, 2, 3, 1, 1)