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Re: [PATCH] Add cl-map-into, revision 2

From: akater
Subject: Re: [PATCH] Add cl-map-into, revision 2
Date: Thu, 07 Oct 2021 08:24:32 +0000

Eli Zaretskii <eliz@gnu.org> writes:

> Is there any reasons you excluded other kinds of sequences (strings
> and bool-vectors)?

I forgot strings aren't vectors in Elisp (I rarely deal with vectors).

Both strings and bool-vectors are arrays so I could simply replace
vector with array wherever it matters.  This would include char-tables
too; I don't have experience with those.

But it is conceivale that Elisp might get arrays that are not sequences
in the future.  E.g. CL has multidimensional arrays.  Elisp manual
mentions “all [currently defind types of array are] one-dimensional” so
the notion of multidimensional array is recognised already.

It thus would be nice to have a special type for one-dimensional array.
In CL, it's precisely “vector”.

Anyway, I don't hope this type will appear soon so for the time being
I'll just replace “vector” with “array”.

>> +  (should (equal [42 42 42]
>> +                 (let ((s (vector 18 19 20)))
>> +                   (cl-map-into s #'+ s '(6 4 2 1 not-even-a-number) s)
>> +                   s))))
>> +
> I don't see here any tests where the lengths of the sequences are
> different.  Can you add some of those?

Lengths are different in the last test.

But it reminded me that I should add an example with a circular list.
After all, this is the case where current implementations of cl-
mappers break (for 3 arguments and beyond).

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