GroupByStreamTransformer<T, S> class

The GroupBy operator divides a Stream that emits items into a Stream that emits GroupByStream, each one of which emits some subset of the items from the original source Stream.

GroupByStream acts like a regular Stream, yet adding a 'key' property, which receives its Type and value from the _grouper Function.

All items with the same key are emitted by the same GroupByStream.


GroupByStreamTransformer(S grouper(T event))
Constructs a StreamTransformer which groups events from the source Stream and emits them as GroupByStream.


hashCode → int
The hash code for this object.
read-only, inherited
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited


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


operator ==(dynamic other) → bool
The equality operator.