Re: Failed to skip from chapter tex file to master pdf file.

[Hongyi Zhao]

On Mon, Jul 12, 2021 at 6:31 PM Tassilo Horn <tsdh@gnu.org> wrote:
>
> Hongyi Zhao <hongyi.zhao@gmail.com> writes:
>
> >> (delq nil '(nil 1 nil)) ;=> (1)
> >> (delq nil '(nil nil nil)) ;=> nil, aka, the empty list ()
> >> (eq nil '()) ;=> t
> >
> > Got it. The `nil' shown in my example just means the empty result list
> > (). The `nil' in itself can be used in different context, when it's
> > used as boolean variable, it means false. But it can also be used to
> > represent an empty list ().
>
> Exactly that. :-)

Perhaps this is one of the reasons why LISP is efficient, powerful,
abstract and highly concise. Another distinguishing feature is that it
only relies on symbol expression to do all complicated logical without
using syntax, just as many other languages do. I find myself becoming
more and more fond of this language, because I don't need to memorize
the tedious grammar rules and just think about what I want to do.

Regards
-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
No. 473, Quannan West Street, Xindu District, Xingtai, Hebei province