None<t extends Object?> class

Inheritance
Available extensions

Constructors

None()
const

Properties

hashCode → int
The hash code for this object.
no setteroverride
runtimeType → SumRuntimeType
A representation of the runtime type of the object.
no setterinherited

Methods

apply(Maybe<T> arg) → Maybe<U>

Available on Maybe<U Function(T)>, provided by the MaybeApply extension

Apply the arg arg to this Function only in case both the arg and Function are available.
bind<T1>(Maybe<T1> f(t)) → Maybe<T1>
Executes an mapping operation which is partial in case an value is present and flattens the result into a single Maybe.
inherited
cast<T1>() → Maybe<T1>
Cast this Maybe<T> into an Maybe<T1>, throwing an TypeError if not possible.
inherited
fillWhenNone(t value) → Maybe<t>
In case this is None, add the value, resulting in a Just, otherwise keep the current value.
inherited
filter(bool predicate(t)) → Maybe<t>
In case theres a value, keep it in case the predicate is true, otherwise return None.
inherited
filterNonNullable() → Maybe<T>

Available on Maybe<T>, provided by the MaybeNonNullableE extension

In case theres a value, keep it only if it is not null, otherwise return None.
filterNonNullable() → Maybe<T>

Available on Maybe<T?>, provided by the MaybeNullableE extension

In case theres a value, keep it only if it is not null, otherwise return None.
fmap<B>(B fn(t p1)) → Maybe<B>
inherited
lift<A, B>(Maybe<B Function(A)> fn, Maybe<A> a) → Maybe<B>
inherited
map<T1>(T1 f(t)) → Maybe<T1>
Executes an mapping operation in case an value is present and wraps it with Just, otherwise returns None.
inherited
maybeFill(Maybe<t> other) → Maybe<t>
In case this is None, return other, otherwise keep the current value.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
pure<T1>(T1 value) → Maybe<T1>
inherited
toEither<L>({L? l, L get()?}) → Either<L, T>

Available on Maybe<T>, provided by the MaybeToEither extension

toList() → List<t>
Convert this Maybe to an List, with None being an empty list and Just being an list that contains just the value.
inherited
toString() → String
A string representation of this object.
override
unit<T1>(T1 value) → Maybe<T1>
inherited
valueOr(t orElse) → t
In case there is a value, retrieve it, otherwise return the orElse value.
inherited
valueOrElse(t orElse) → t
In case there is a value, retrieve it, otherwise return the orElse value.
inherited
valueOrGet(t get()) → t
In case there is a value, retrieve it, otherwise return the result of the get callback.
inherited
visit<R extends Object?>({required R just(t _value), required R none()}) → R
override
where(bool predicate(t)) → Maybe<t>
In case theres a value, keep it in case the predicate is true, otherwise return None.
inherited
whereNotNull() → Maybe<T>

Available on Maybe<T>, provided by the MaybeNonNullableE extension

Transforms null into None In case theres a value, keep it only if it is not null, otherwise return None.
whereNotNull() → Maybe<T>

Available on Maybe<T?>, provided by the MaybeNullableE extension

In case theres a value, keep it only if it is not null, otherwise return None.

Operators

operator ==(Object other) → bool
The equality operator.
override
operator >>(Maybe<T> arg) → Maybe<U>

Available on Maybe<U Function(T)>, provided by the MaybeApply extension

Apply the arg arg to this Function only in case both the arg and Function are available.