ExhaustMapStreamTransformer<S, T> class

Converts events from the source stream into a new Stream using a given mapper. It ignores all items from the source stream until the new stream completes.

Useful when you have a noisy source Stream and only want to respond once the previous async operation is finished.

Example

// Emits 0, 1, 2
Stream.periodic(Duration(milliseconds: 200), (i) => i).take(3)
  .transform(ExhaustMapStreamTransformer(
    // Emits the value it's given after 200ms
    (i) => Rx.timer(i, Duration(milliseconds: 200)),
  ))
.listen(print); // prints 0, 2

Inheritance

Object
StreamTransformerBase<S, T>
ExhaustMapStreamTransformer

Constructors

ExhaustMapStreamTransformer(Stream<T> mapper(S value)): Constructs a StreamTransformer which maps each event from the source Stream using mapper. [...]

Properties

hashCode → int: The hash code for this object. [...]
read-only, inherited
mapper → Stream<T> Function(S value): Method which converts incoming events into a new Stream
final
runtimeType → Type: A representation of the runtime type of the object.
read-only, inherited

Methods

bind(Stream<S> stream) → Stream<T>: Transforms the provided stream. [...]
override
cast<RS, RT>() → StreamTransformer<RS, RT>: Provides a StreamTransformer<RS, RT> view of this stream transformer. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent method or property is accessed. [...]
inherited
toString() → String: Returns a string representation of this object.
inherited

Operators

operator ==(Object other) → bool: The equality operator. [...]
inherited