None<T> class

Implemented types

• Option<T>

Constructors

None()

const

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

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 /(dynamic a) → dynamic

Returns None or throws an error if it is Some Convinient operator to get the error from the result, user should ensure that the value is None, otherwise it will throw an UnimplementedError Usage: final res = Option.none(); final err = res / 0; assert(err is None);

override

operator ==(Object other) → bool

The equality operator.

inherited

operator |(dynamic _) → T

Returns the Value if it is Some or throws an error if it is None Convinient operator to get the value from the result, user should ensure that the result is Some, otherwise it will throw an UnimplementedError Usage: final res = Option

override

operator ~() → None

Returns the inner Value from Some or None Convinient operator to get the inner value from the Option, Usage: final res = Option

override