The reserved wordnull denotes an object that is the sole instance ofthis class.

TheNull class is the only class which does not implementObject.It is a compile-time error for a class to attempt to extend or implementNull.

The language contains a number of specialized operators for working withnull value. Examples:

e1!       // Throws if e1 is null.e2 ?? e3  // Same as e2, unless e2 is null, then use value of e3x ??= e4  // Same as x unless x is null, then same as `x = e4`.e5?.foo() // call `foo` on e5, unless e5 is null.[...? e6] // spreads e6 into the list literal, unless e6 is null.

Properties

hashCode→int

The hash code for this object.

no setteroverride

runtimeType→Type

A representation of the runtime type of the object.

no setterinherited

Methods

noSuchMethod(Invocationinvocation)→ dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString()→String

Returns the string"null".

override

Operators

operator ==(Objectother)→bool

The equality operator.

inherited