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bug#18923: Alternative scrolling model

From: Stefan Monnier
Subject: bug#18923: Alternative scrolling model
Date: Sun, 02 Nov 2014 10:56:15 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4.50 (gnu/linux) 
>> (cl-incf ammount vscroll)
> Why not use '(setq amount (+ amount vscroll))' instead?  It should be
> marginally faster.

No, it's identical:

   (macroexpand '(cl-incf ammount vscroll))
   => (setq ammount (+ ammount vscroll))

> why is it a good idea to use cl-reduce here,

Because it's a lot more concise.


        Stefan
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