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bug#24014: 24.5; doc string of `cl-reduce'
From: |
Clément Pit--Claudel |
Subject: |
bug#24014: 24.5; doc string of `cl-reduce' |
Date: |
Mon, 18 Jul 2016 10:54:21 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 |
On 2016-07-18 06:41, Drew Adams wrote:
> Even providing a functional-programming definition of `reduce' is
> better than just describing it in abstract terms, if we can't come
> up with a more down-to-earth description.
What about adding a few examples? Something like this maybe?
(cl-reduce f '(1 2 3 4 5))
↔ (f (f (f (f 1 2) 3) 4) 5)
(cl-reduce f '(1 2 3 4 5) :initial-value 0)
↔ (f (f (f (f (f 0 1) 2) 3) 4) 5)
(cl-reduce f '(1 2 3 4 5) :from-end t)
↔ (f 1 (f 2 (f 3 (f 4 5))))
(cl-reduce f '(1 2 3 4 5) :from-end t :initial-value 0)
↔ (f 1 (f 2 (f 3 (f 4 (f 5 0)))))
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