sampleTime method
Emits the most recently emitted item (if any) emitted by the source
Stream since the previous emission within the recurring time span,
defined by duration
Example
Stream.fromIterable([1, 2, 3])
.sampleTime(Duration(seconds: 1))
.listen(print); // prints 3
Implementation
Stream<T> sampleTime(Duration duration) =>
sample(Stream<void>.periodic(duration));