From: Michael Heerdegen <michael_heerdegen@web.de>
To: Stefan Huchler <stefan.huchler@mail.de>
Cc: help-gnu-emacs@gnu.org
Subject: Re: Can't figure out how to create a tabulated-list-mode with visible
Date: Wed, 12 Oct 2016 11:28:28 +0200 [thread overview]
Message-ID: <87k2ddrk5f.fsf@web.de> (raw)
In-Reply-To: <87y41upcrg.fsf@jupiter.lan> (Stefan Huchler's message of "Wed, 12 Oct 2016 03:38:43 +0200")
Stefan Huchler <stefan.huchler@mail.de> writes:
> Well I guess I misread the description. Each has the form, so the
> additional parenthesis makes sense, but why is a ' needed for entries
> but not for format?
Good question! One might assume that () and [] are quite symmetric, but
there are important differences.
Lisp programs are written as lists (and not as vectors). If you want a
list constant (at a position that is evaluated), you need to quote the
list to prevent evaluation, otherwise it would be interpreted as code.
OTOH, the syntax for vectors, [element...], is only used to describe
vectors. Vectors are self-evaluating objects, so you don't need to
quote. It wouldn't harm OTOH, but I guess it would look quite strange
to most people.
Regards,
Michael.
prev parent reply other threads:[~2016-10-12 9:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-09 16:08 Can't figure out how to create a tabulated-list-mode with visible Stefan Huchler
2016-10-11 1:30 ` Michael Heerdegen
2016-10-12 1:38 ` Stefan Huchler
2016-10-12 9:28 ` Michael Heerdegen [this message]
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