main.dart

extension NumberParsing on String {
  int parseInt() {
    return int.parse(this);
  }

  double parseDouble() {
    return double.parse(this);
  }
}

void main(){
  var numString = "100";
  var numInt = numString.parseInt();
  print(numInt is int);
  var numDouble = numString.parseInt();
  print(numDouble is double);
}