Null class
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 implement
Null.
The language contains a number of specialized operators for working with
null
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. [...]
read-only, override
- runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
Methods
-
toString(
) → String -
Returns the string
"null"
.override -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed. [...]
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator. [...]
inherited