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update post: How does in-built Array iterator work?

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2020-07-12 15:17:13 +05:30
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We use `[...someArray]` or `array.values()` to get multiple values out of a array. And we kind of know how it works - it just returns us all the values from the array. Internally, both of them uses the iterator protocol - which is already defined on array prototype.
But do we really know the details of how in-built Array iterator works? Can you write a precise polyfill to implement iterator protocol on Array?
But do we know exactly how the in-built Array iterator works? Can you write a precise polyfill to implement iterator protocol on Array?
## A little about the iterator protocol