Leetcode 284. Peeking Iterator
Wrap an existing iterator to add a peek() operation that returns the next element without advancing the iterator, while preserving correct behavior for next() and hasNext() across multiple calls. The challenge is to maintain the iterator state so peek() can be called repeatedly without consuming the element (and to generalize this design for any type).
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Roku
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Early May, 2026
Roku
Senior
class PeekingIterator implements Iterator<T> this was using generics
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