Re: need for 'dynamical-let'?

[Stefan Monnier]

> (let (branch-list
>       ...)
>    (add-to-list 'branch-list (substring branch-entry 2) t)

This is butt-ugly and ridiculously inefficient.
In such code, don't use add-to-list (which is OK for configuring
global vars, but not for such situations) and don't use the t argument
which makes the operation O(N).
As Dmitry says, using `push' or `cl-pushnew', and if need the object in
some other order, re-order them later, e.g. with nreverse.


        Stefan