Dart : Null

Dart provide many unique function compare to other language , therefore dart is popular language among the developer.

One of the unique function of dart in Unsafety, which means dart also support the Null value in variable.

Null safety make code safer and run faster.

in null safety we use two symbol " ? ! " .

Where " ? " indicate that we can assign the variable to null.

Here, I am providing the example of Null safety.

    void main()
  {
   int? x;
   print(x); // null
  }

  void main()
  {
   int? x;
   print(x);
   int y =x!;
  }

• In this we get the error like " Null check operator used on a null value " due to here x is nullable type where is notnullable type but we force to run this program by putting " ! ".