Buffers a number of values from the source Observable by count then emits the buffer as a Stream and clears it, and starts a new buffer each startBufferEvery values. If startBufferEvery is not provided, then new buffers are started immediately at the start of the source and when each buffer closes and is emitted.
count is the maximum size of the buffer emitted
Observable.range(1, 4) .windowCount(2) .asyncMap((stream) => stream.toList()) .listen(print); // prints [1, 2], [3, 4] done!
if startBufferEvery is 2, then a new buffer will be started on every other value from the source. A new buffer is started at the beginning of the source by default.
Observable.range(1, 5) .bufferCount(3, 2) .listen(print); // prints [1, 2, 3], [3, 4, 5],  done!
Stream< T>stream) → Stream< Stream< T>>
Transforms the provided
RS, RT>( ) → StreamTransformer< RS, RT>
StreamTransformer<RS, RT>view of this stream transformer. [...]inherited
Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
) → String
A string representation of this object. [...]