Option<T> class abstract

Represents a value that could be missing - an [option]al value.

If the value is present, then it will be wrapped in a Some instance. If the value is missing, then it will represented with a None instance.

Implementers

• None
• Some

Available extensions

• MapOptionExtension

Constructors

Option()

const

Option.fromJson(dynamic json, T fromJsonT(dynamic json))

Adds support for the json_serializable package.

factory

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

extract<T>(K key) → Option<T>

Available on Option<Map<K, dynamic>>, provided by the MapOptionExtension extension

Return an Option that conditionally accesses map keys, if they match the given type. Useful for accessing nested JSON.

extractMap(K key) → Option<Map<K, dynamic>>

Available on Option<Map<K, dynamic>>, provided by the MapOptionExtension extension

Return an Option that conditionally accesses map keys, if they contain a map with the same key type. Useful for accessing nested JSON.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toJson(Object? toJsonT(T v)) → Object?

Adds support for the json_serializable package.

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited