Re: for a given emacs session: insert a subject with an increasing counter

[Bodertz <bodertz@gmail.com>]

Emanuel Berg <moasenwood@zoho.eu> writes:

> or can one have several functions in a/one closure `let'?

You can.  A simple example:


    (let ((counter 0))
      (defun decrement-counter ()
        (cl-decf counter))

      (defun increment-counter ()
        (cl-incf counter))

      (defun reset-counter ()
        (setq counter 0)))


> (Unbelievable that I never read this in a single computer book
> of all the tons I've read. Unbelievable people who write
> them. Or?)

There is a book called 'Let Over Lambda' which is named after this
concept: the 'let' is over the 'lambda' (or 'defun', in this case).  I
haven't read it, but it's how I heard of this idea.