On 2014-11-10, giacomo boffi <giacomo_bo...@inwind.it> wrote:
> On 11/09/2014 11:44 AM, satishmlm...@gmail.com wrote:
>> What does zip return in the following piece of code?
>
> To help you understanding what is the `zip` builtin, please forget
> about PKZip etc and think about the _zip fastener_ or _zipper_ in
> your bag or in your trousers
>
> In the bag you have two sequences of teeth that the zipper
> binds together in interlocking pairs
No, you don't. That's not how a zipper works. Each tooth from side A,
isn't bound with one from side B. It's bound with _two_ of them from
side B. And each of those is in turn bound with an additional tooth
from side A, and so on...
> In your program you have two lists, whose elements `zip` returns
> bound together in pairs
What the zipper on a coat does is convert two separate sequences into
a single sequence where the members alternate between the two input
sequences. IOW if we want to do something analogous to a zipper
fastener it should do this:
zip([a,b,c,d,e,f],[1,2,3,4,5,6]) => [a,1,b,2,c,3,d,4,e,5,f,6]
Item '1' is bound equally to item 'a' and 'b'. Item 'b' is bound
equally to item '1' and '2'.
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