It is a double loop; what's your point? This isn't "come up with the most efficient way to do X", or "do X without using a nested loop", it is (at least so far as I am interested) "show me idiomatic ways to do X". To quote Ovid, " I am wondering how different types of languages would solve the problem of identifying elements in one array that exist in another". I suppose Perl 6 isn't a different type of language than (recent) previous versions of Perl, but I thought the DWIM aspect of the Perl 6 code made the example worth posting.
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