void main() {  var a = 1;  print(a);  int b = 2;  print(b);  final c = 'Hello';  // c = 'Hello again'; // Uncomment to throw  print(c);  const d = 'World';  print(d);}

 

If we attempt to reset 'final' to a different value, we will get an error. The difference in practice between const and final is you use final when certain instance variables belong into classes.