Re: Appending lists

[Emanuel Berg]

Jean Louis wrote:

>> What changed was the cdr of some cons cell downstream.
>> The variable doesn't see it.
>
> You speak of some hidden flows?

He speaks of how a list is implemented as a data structure.

> How is that useful for programer in Emacs Lisp?

Well, in this case, you yourself gave an example with
potentially unexpected results from using `nconc'. So to not
have that, it is good to be aware of.

More broadly, because Lisp is all focused around the universal
data structure, i.e. the list, is it helpful to know your way
around them!

And speaking even more generally, if you are into technology
and use it every day, the more you know and understand, the
higher you can take your own game...

> Did variable's value change or not?

No, the value is a reference to a cons cell and that reference
didn't change.

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