Null class - dart:core library (original) (raw)

The reserved word null denotes an object that is the sole instance of this class.

The Null class is the only class which does not implement Object. 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 e3
x ??= 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(Invocation invocation)→ dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString()→ String

Returns the string "null".

override

Operators

operator ==(Object other)→ bool

The equality operator.

inherited