finaconst.dart

class Example {
  final String someText;
  
  const Example(this.someText);
}

void main() {
  int value = 2;
  value = 3; // Ok, field is not final
  
  final int value2 = 5;
  // value2 = 6; This is not ok. It is a compile-time error.
  
  Example value3 = const Example("Hi");
  value3 = Example("Hi2"); // This is ok! It is not final!
  
  const Example value4 = Example("Hi"); // value4 is const, and also its const constructor is implicity called
  // value4 = Example("what now?"); This is not allowed! Also a compile-time error.
  
  
  // Note about type inference: You don't need to explicity type the variable when using final or const, so:
  const value5 = Example("This is a const instance of type Example");
  final value6 = 0; // Integer

}