🅿️IteratorProtocol
- Swift in Depth ⟩ Ch 9: Iterators, sequences, and collections 
- Swift ⟩ - IndexingIterator<Element> - [Element].makeIterator() 回傳的 iterator 
 
- SwiftDoc ⟩ IteratorProtocol 
public protocol IteratorProtocol {
  associatedtype Element
  mutating func next() -> Element?
}Last updated
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