Final and const Keyword

/// "final" keyword : Set once but it is initialized when it is accessed.
/// "const" keyword : It is compilation time constant.
/// Const variables must be initialized with a constant value. Hence, whenever we have a value that
/// we know at compile-time and want it to be constant, we use the const keyword,
/// while if we don't know the value at compile-time and if it is to be calculated and run-time and
/// want it to be constant, we use the final keyword!
void main() {

  ///   1st difference between final and const keyword
  // /// Usage of "final"
  // final a = 10;   //"a" will not occupy memory space until we don't use of variable "a"
  // print(a);       //After printing OR performing action on variable(a) value, it will occupy memory space
  //
  // /// Usage of "const"
  // const b = 22; //Here, b will occupy memory space
  // print(b);

  ///  2nd difference between final and const keyword
  // ///   Declaration of final variable
  // final m  = 2;
  //
  // ///   Declaration of const variable
  // const n = 5;

  ///   3rd difference between final and const keyword
  ///   Declaration of final variable
  // int x = 1, y = 2;
  //
  // final a = x;  //here, will not give Error
  // print(a);
  //
  // //const b = y; //here, will give Error
  // const b = 2;  //here, will not give Error
  // print(b);

  ///   4rth difference between final and const keyword
  // final name;   //At declaration time, Not mandatory to initialize value to variable
  // name = "Rajan"; //After declaration, we can assign value to variable
  // print(name);

  // const book = "ExperimentOfTrue";  //At declaration time, Mandatory to initialize value to variable
  // print(book);    //After declaration, we can't assign value to variable

  ///   5th difference between final and const keyword
  final name = [
    "Raman",
    "Raju",
    "Ramanujan",
    "Rajesh",
    "Aman"
  ];
  name.add("Peter");  //we can add OR modify data in "final"
  print(name);

  // const name = [
  //   "Raman",
  //   "Raju",
  //   "Ramanujan",
  //   "Rajesh",
  //   "Aman",
  // ];
  // name.add("Peter");  //we can't add OR modify data in "const"
  // print(name);    //It will give Error on console

}

///The main difference between const and final is that const can be considered as a compile-time constant
/// while final can be considered as a run-time constant. So when you want the constant value and
/// you are aware of the value to be assigned, at the compile-time itself, you can use const!
/// But let’s say you want a constant value but you don’t know its value at compile-time,
/// then you can use final!