Re: Possible to conditionally bind variable?

[Rusi]

On Thursday, September 11, 2014 6:04:33 PM UTC+5:30, Stefan Monnier wrote:
> > (defun go-or-make-agenda (&optional new-frame)
> >   (interactive "P")
> >   (let ((buffer "\*Org Agenda\*")
> >         (some-other-buffer "*scratch*")
> >         (my-switch-function (if new-frame ;; is there some way to do this?
> >                                 'switch-to-buffer-other-frame
> >                               'switch-to-buffer)))
> >     (if (get-buffer buffer)
> >         (funcall my-switch-function buffer)
> >       (funcall my-switch-function some-other-buffer))))

> Aka

>    (defun go-or-make-agenda (&optional new-frame)
>      (interactive "P")
>      (let ((buffer "\*Org Agenda\*")
>            (some-other-buffer "*scratch*")
>            (my-switch-function (if new-frame ;; is there some way to do this?
>                                    'switch-to-buffer-other-frame
>                                  'switch-to-buffer)))
>        (funcall my-switch-function
>                 (if (get-buffer buffer) buffer some-other-buffer))))

> Aka

>    (defun go-or-make-agenda (&optional new-frame)
>      (interactive "P")
>      (let ((buffer "\*Org Agenda\*")
>            (some-other-buffer "*scratch*"))
>        (funcall (if new-frame 'switch-to-buffer-other-frame 'switch-to-buffer)
>                 (if (get-buffer buffer) buffer some-other-buffer))))

Seeing this beautiful code, cant help making the remark:
This is called functional programming; guys like Stefan do it
guys like talk about it.

Here is some more talk -- what Stefan has demoed above is one of the
many cases outlined there:

http://blog.languager.org/2012/10/functional-programming-lost-booty.html