Rx.Observable.prototype.expand(selector, [scheduler])

Expands an observable sequence by recursively invoking selector.

参数

1. selector (Function): Selector function to invoke for each produced element, resulting in another sequence to which the selector will be invoked recursively again.
2. [scheduler=Rx.Scheduler.immediate] (Scheduler): Scheduler on which to perform the expansion. If not provided, this defaults to the immediate scheduler.

返回值

(Observable): An observable sequence containing a single element determining whether all elements in the source sequence pass the test in the specified predicate.

例