None<A> class

Represents the absence of a value. It's a concrete implementation of Option.

Use None to indicate that no value exists, typically in scenarios where in other languages one might use null or undefined.

Example:

final optionValue = None<int>();

Inheritance

• Object
• Option<A>
• None

Constructors

None()

const

Properties

hashCode → int

The hash code for this object.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

override