Re: About `funcall'

[Xue Fuqiao]

> Xue Fuqiao <xfq.free@gmail.com> writes:
>
> > In `yank-pop', there is an sexp about `funcall':
> >
> >   (funcall (or yank-undo-function 'delete-region) (point) (mark t))
> >
> > IIRC the first argument for `funcall' should be a function, so I'm
> > confused with this usage.  Can somebody explain it to me?  Thanks.
>
> `or' returns the first argument that is not nil, or nil when all the
> arguments are nil.

I see, thanks.

>     (defmacro .or (&rest args)
>       (if (null args)
>          'nil
>          (let ((var (gensym)))
>           `(let ((,var ,(first args)))
>              (if ,var
>                 ,var
>                 (.or ,@(rest args)))))))
>
>     (macroexpand '(.or a b))
>     --> (let ((#1=#:G90861 a)) (if #1# #1# (\.or b)))--

What does "(first args)" mean here?  Does it mean "(car args)"?