Add a .join() method to do element-wise joining of vectors about vek HOT 2 CLOSED

Sorry for the late reply!

I see the point of your example. Interestingly, a.join(b) is a.map2(b, |a, b| (a, b)); this is a nice property for implementing it with vectors of any length.

Since it is also equivalent to a.into_iter().zip(b).collect(), I'm wondering if we should call it zip(), and if other libraries have a join() method for similar types (maybe it has a different meaning?).

In any case it's not that big a deal. I would go with zip() for consistency with the standard library (I mean that's more or less what we're doing with map()) but it's OK if you prefer join()!

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For instance in the standard library, join() is used for the famous "join strings" operations; the only thing that concerns me is that the meaning of join() for vectors might not be obvious, but zip() more or less is, and Iterator helps because it established a meaning for it.

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