None<TValue> class final

None is a type that does not contain a value.

Inheritance

• Object
• Option<TValue>
• None

Annotations

• @immutable

Constructors

None.new()

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

map<T>({required T onSome(TValue value), required T onNone()}) → T

Maps the Option to a new Option based on the provided onSome and onNone functions.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

onNone(void onNone()) → Option<TValue>

Calls the provided onNone function if the Option is a None instance.

inherited

onSome(void onSome(TValue value)) → Option<TValue>

Calls the provided onSome function if the Option is a Some instance.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

override