Re: [External] : Re: Appending lists

[Emanuel Berg]

Drew Adams wrote:

>> 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?
>
> Read your mail quickly. HTH. In general, you can use
> a "destructive" function such as `nreverse' on something
> that you've created, e.g. as a separate object from other
> existing objects. E.g., if you _copy_ a list then you can
> use `nreverse' on your copy without bothering the list
> you copied.
>
> Depending on the kind of "destructive" operation, you might
> need to make a deep copy. In all cases, if you use
> a destructive operation, you should know what it does -
> that's a prerequisite, unless you really enjoy surprises.

"Copy", you mean to send the value as an argument?

What's a "deep copy"?

I have used `nconc' 7 times and `nreverse'. Still no surprises
so maybe I just haven't committed to them enough.

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