q: what is the streamish way to do this, if there is one:
look at a stream of items for a (hardwired in my case) criterion, returning the emptySet if they meet it, and the set of all of them if they don't?
look at a stream of items for a (hardwired in my case) criterion, returning the emptySet if they meet it, and the set of all of them if they don't?
N.B. I know how to do this w/o using stream-ish operations. I was just wondering if there's some sexy stream way.
I don't care about efficiency, either, or the optimal solution for my case. I am specifically asking a question about stream operations.
Another way to answer the question: is there a way to return early in the middle of a chain of stream operations?
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