Iterator is not only about collections. Its not as powerful as a yield around continuations but you can return whatever you like. ~15 (?) years ago I wrote a "

Iterator is not only about collections. Its not as powerful as a yield around continuations but you can return whatever you like. ~15 (?) years ago I wrote a "famous" blog post on how to use Iterator as a poor man Maybe/Option. for (String s: m Option<String>) { // Executed on Some }