> > Write a function zip(lst1, lst2) such that zip accepts two equal
> > length lists and returns a list of pairs. For example, zip(['a', 'b',
> > 'c'], [10, 20, 30]) should evaluate to the list [('a', 10), ('b', 20),
> > ('c', 30)].
>
> Hey not even a rebinding necessary. :-)
>
We had some exercises like this in Scheme in my undergrad programming
languages class (specifically, rewriting map/mapcar). It's not that
the method doesn't already exist in the language, it's more about
understanding what's going on at a lower level.
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