Most of the tutorial is outdated

[yolowex]

I just started with dart but it seems that this tutorial is outdated and the most recent dart version has
groundbreaking changes that break backwards compatibility.

this is from 21_getters_setters for example:

class Student {

  String name; // Non-nullable instance field 'name' must be initialized.

  double _percent; // Non-nullable instance field '_percent' must be initialized.

  void set percentage(double marksSecured) => _percent = (marksSecured / 500) * 100;

  double get percentage => _percent;
}

I copied the errors that dartpad.dev gave me, into the code above as comments.

both the name and _percent fields have to be initialized now. it's saying about non-nullable types,
I'm pretty sure I read somewhere that every type in dart is an object and therefore set to null when initialized without a value.

[m-aqsam]

Exactly i also found the same and many more .