On 11/10/2014 3:36 PM, Cameron Simpson wrote:
On 10Nov2014 17:19, Grant Edwards <invalid@invalid.invalid> wrote:
On 2014-11-10, giacomo boffi <giacomo_bo...@inwind.it> wrote:
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...
This is true, but the analogy is still the correct one:-)
Perhaps ironically in this context, zippers replaced hook-and-eye
fastening, where the two sequences *are* matched in parallel. "Hookless
fastener" was one of the original names (Wikipedia).
--
Terry Jan Reedy
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