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What is Iterator?

The Iterator protocol defines how objects expose a sequence of values through a next() method. Any object that implements Symbol.iterator becomes iterable — usable in for...of loops, destructuring, and spread syntax. Custom iterators give you full control over data traversal.

○Iterator Protocol: Array ○Iterator Protocol: String ○Iterator Protocol: Set ○Iterator Protocol: Map ○Iterator Protocol: done ○Iterator: for...of array ○Iterator: for...of string ○Iterator: for...of map ○Iterator: for...of set ○Iterator: for...of sum ○Iterator: spread set ○Iterator: spread string ○Iterator: spread map ○Iterator: spread generator ○Iterator: spread multi ○Iterator: destructuring basic ○Iterator: destructuring rest ○Iterator: destructuring skip ○Iterator: destructuring generator ○Iterator: destructuring string

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IteratorSymbol.iteratorbeginner

Iterator Protocol: done

Check that done is true after iteration.

Iterator Protocol: done

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