Section 12 Code Shown by Instructor will not work when Null Safety is enabled.

[longtimedeveloper]

Section 12 Code Shown by Instructor will not work when Null Safety is enabled.

This section requires updating. Students not familiar with Null Safety will be in a bad place of frustration.

[Lakhankumawat]

The parameter 'cardChild' can't have a value of 'null' because of its type, but the implicit default value is 'null'.

• Yeah Yeah i searched a lot on this topic and landed outside somewhere where i don't know what exactly null safety is and how to use it.
• Actually in her code it didn't show that error but in recent versions it's a problem , they should update the section.

[Lakhankumawat]

How to use widgets and objects inside a class without instantiating it such that by default value of that widget is not null

[vinayak5002]

Hey, even I was struggling with the same problem, and I somehow managed to solve it:
Actually you have to just add a ?. Here is how:

class BaseCard extends StatelessWidget {

  BaseCard( {required Color color, Widget? cardChild} ){
    this.color = color;
    this.cardChild = cardChild;
  }

  late Color color;
  late Widget? cardChild;

notice there is a ? after Widget in

BaseCard( {required Color color, Widget? cardChild} )

, this says that cardChild is nullable
(* you have to put ? after Widget during initialising also late Widget? cardChild;)
i hope it was help full