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Re: master d62766305a: Add `take` and `ntake` (bug#56521)
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From: |
Philip Kaludercic |
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Subject: |
Re: master d62766305a: Add `take` and `ntake` (bug#56521) |
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Date: |
Mon, 18 Jul 2022 18:56:24 +0000 |
Sam Steingold <sds@gnu.org> writes:
>> * Mattias Engdegård <znggvnfr@npz.bet> [2022-07-17 11:47:25 -0400]:
>>
>> branch: master
>> commit d62766305ad8fe6ca1695341c34b9836d051e3cb
>> Author: Mattias Engdegård <mattiase@acm.org>
>> Commit: Mattias Engdegård <mattiase@acm.org>
>>
>> Add `take` and `ntake` (bug#56521)
>>
>> These are useful list primitives, complementary to `nthcdr`.
>
> How are these better than the venerable butlast and nbutlast?
> https://www.gnu.org/software/emacs/manual/html_node/elisp/List-Elements.html#index-butlast
> note that butlast and nbutlast have a very long Lisp history, they
> appear also in Common Lisp and many lisps before that.
The immediate advantage I recognise is that you don't need to determine
the length of the list if you are actually just interested in the first
n, not just not-interested in the last m.