Quote: interruptible iterators allow updates to the underlying collection; efficient, easier to use

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This paper introduces interruptible iterators, a language feature … [Iterators can be] awkward to implement correctly and efficiently, especially … current element. … Interruptible iterators are … coroutines in which the loop body is able … differently and have resumption semantics. … A JMatch reimplementation of the Java Collection Framework … [using interruptible iterators] shows that … also be implemented efficiently.   Google-1   Google-2

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