Interface representing a stream that has a current or initial value as well.
) → FutureOr< T?>
R>( R mapper(T input)) → ValueStream< R>
- Basics of converting something over
Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
[T? ifAbsent]) → T?
) → String
A string representation of this object. [...]