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

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## How does in-built Array iterator work?
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.
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 all the values from the array. Now internally, both of them uses the iterator protocol - which is already defined on array prototype.
But do we know exactly how the in-built Array iterator works? Can you write a precise polyfill to implement iterator protocol on Array?