Dart Type Test Operators

Type Test Operators in Dart

These operators are used to check the types of expressions at runtime. Dart is a typed language, and we often want to assert that a value is of a correct type or change the type of a value to a related type.

Consider the following table that contains the list of all the type test operators in Dart :

Sr.	Operator	Description
1.	as	It is used for typecast.
2.	is	It returns TRUE if the object has specified type.
3.	is!	It returns TRUE if the object has not specified type.

Program

Consider the following code in Dart that explains the type test operators in Dart,

void main( )
{
 String a = ' JavaTpoint ' ;


  // is type operator
  var b = a is String ;
  print( ' Is JavaTpoint a string ? ' ) ;
  print( b ) ;
  
  // is! type operator
  var c = a is! String ;
  print( ' Is JavaTpoint not a string ? ' ) ;
  print( c ) ;
}

Output

 Is JavaTpoint a string ? 
 True


 Is JavaTpoint not a string ? 
 False