Some<T> class final

Option state for a present value.

Match this state to read the present value.

const option = Some<String?>('John');

final label = switch (option) {
  None<String?>() => 'Anonymous',
  Some<String?>(:final value) => value ?? 'No nickname',
};

Inheritance

• Object
• Option<T>
• Some

Constructors

Some(T value)

Creates a present option state.

const

Properties

hashCode → int

The hash code for this object.

no setter, override

isNone → bool

Whether this option is None.

no setter, inherited

isSome → bool

Whether this option is Some.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

value → T

Replacement value, including null for nullable fields.

final

Methods

andThen<R>(Option<R> next(T value)) → Option<R>

Chains another option-producing operation when a value is present.

override

map<R>(R mapper(T value)) → Option<R>

Maps a present value and leaves absent values unchanged.

override

match<R>({required R some(T value), required R none()}) → R

Pattern matches this option.

override

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

unwrapOr(T fallback) → T

Returns the present value, or fallback when this option is absent.

override

unwrapOrElse(T fallback()) → T

Returns the present value, or computes one when this option is absent.

override

Operators

operator ==(Object other) → bool

The equality operator.

override