interval method
Creates a Stream that emits each item in the Stream after a given duration.
Example
Stream.fromIterable([1, 2, 3])
.interval(Duration(seconds: 1))
.listen((i) => print('$i sec'); // prints 1 sec, 2 sec, 3 sec
Implementation
Stream<T> interval(Duration duration) =>
IntervalStreamTransformer<T>(duration).bind(this);