#      
## Overview

In dart, the **`final` keyword** is used to define immutable constants or objects. It is a runtime constant.


## Syntax
```
// Without datatype
final variable_name;

// With datatype
final data_type  variable_name;
```
## Example
The following code shows how to implement the `final` keyword:


void main(){
  // declaring final variable
   final int num = 10;
   //calculating the sum and assign to variable sum
   int sum = num *  num;
   // displaying result
   print(sum);
}



Let's try reassigning the value for variable `num` in the following code:


void main(){
  // declaring final variable
   final int num = 10;
   //calculating the sum and assign to variable sum
   int sum = num *  num;
   // displaying result
   print(sum);
   // reassigning variable num
   num = 20;
   print(num);
}

What is the final keyword in Dart?

In Dart, the final keyword defines immutable runtime constants or objects, disallowing reassignment.