Optional<T> class
sealed
Constructors
- Optional.empty()
-
factory
- Optional.of(T value)
-
factory
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- value → T?
-
no setter
Methods
-
fold<
R> ({required R onValue(T value), required R onEmpty()}) → R -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
present(
) → bool -
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited