[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: Predicate for true lists

From: Drew Adams
Subject: RE: Predicate for true lists
Date: Mon, 4 Jun 2018 08:31:49 -0700 (PDT)

> > As for `cdr` vs CDR.  The all-caps version is a metavariable referring
> > to something which we happened to call CDR.  E.g.
> >
> >     Foo takes the form (CAR . CDR) where CDR is blabla.
> Right, but I see no such destructuring/metasyntax in the Elisp manual.
> Both "(elisp) Cons Cells" and "(elisp) Cons Cell Type", for example,
> refer directly to the CAR and CDR slots of a cons cell, without first
> illustrating their structure.  Is that OK?

My answer probably does not reflect an Emacs doc-string or
manual convention, but here are my 2 cents anyway:

1. Uppercase: As Stefan said, only when it refers to a
piece of a pattern.

2. Lowercase in code font (e.g. what Stefan wrote as `cdr`
and you wrote as `cdr'): Only when referring to the function.

3. Lowercase otherwise.  In talking about Lisp, "car" and
"cdr" are regular English words, just like "first" and "rest".
They are Lisp jargon words, but they are English nevertheless.

IOW, there's no reason we should not just talk about the cdr
of a list, with no special typography used for the word "cdr".

reply via email to

[Prev in Thread] Current Thread [Next in Thread]