Option<T extends CandidType?> class

Option candid type.

var non_null_optional_text = Option(value: Text('hi'));
var null_optional_text = Option(value: null, value_type: Text());

Check the documentation on the candid library page for more on creating an Option with a null value.

Inheritance

• Object
• CandidType
• ConstructType
• Option

Constructors

Option({T? value, T? value_type, bool type_mode = false})

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

type_mode ↔ bool

late, final, override-getter

value ↔ T?

The value within the Option. Can be set to null. When setting to null make sure the value_type is specified. Check the documentation on the candid library page for more.

late, final

value_type ↔ T?

A CandidType in the type_mode. Check the documentation on the candid library page for more.

late, final

Methods

cast_option<C extends CandidType>() → Option<C>

Casts an Option<CandidType> into an Option<C extends CandidType>. Useful for casting the type of this.value into a specific CandidType

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Constants

type_code → const int