How to create function which return array of widgets

At this time, the following code is deprecated:

List <Widget> gameCells = List<Widget>();

Use the following instead:

List <Widget> gameCells = <Widget>[];

The first code will work anyway, but you will have a warning.

List<Widget> getRandomWidgetArray(){

  List <Widget> gameCells = List<Widget>();
  for(i=0;i<5;i++)
   {
      gameCells.add(new MyCellWidget(i));
   }
  return gameCells;
}

This is the correct way of initializing List, adding elements and returning Widget list.

Array types are List<Type> in Dart:

List<Widget> getRandomWidgetArray()

[] can only be used as literal value to create a new list value, not for type declaration.