Re: Appending lists

[Emanuel Berg]

tomas wrote:

>> Well, let's see, `nreverse' has updated the data without
>> setting the variables to whatever desired values they
>> should take
>
> It can't. It's a function.
>
> Doing (foo x y) will *never* change "the variable x" --
> unless foo is a macro/special form.

Well, OK, I didn't mean that `nreverse' should do it, rather
the programmer didn't use `nreverse' in a setting, perhaps
combined with `setq' as you yourself mention would be the
easiest way...

Maybe that still isn't a guarantee nreverse can't screw up
something else just the same, unsure how to "partition" or
isolate it if you will?

>> so what is left is the variables reference to the first
>> data item (the car), after that tho 1 doesn't have a cdr
>> anymore and 3 has '(2 1), not '(4 5 6).
>
> You can put it this way... if you want to prevent yourself
> from wrapping your head around it.
>
> You should draw your box-and-pointer diagrams [1]. Then,
> you'd get that talking about "the 3" is dangerous talk :)

OK, get back to you if/when I do it.

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