Re: Org to Markdown programmatically

[Jean Louis]

* Emanuel Berg via Users list for the GNU Emacs text editor 
<help-gnu-emacs@gnu.org> [2021-05-05 22:48]:
> For example:
> 
> (require 'cl)
> 
> (cl-loop for (x y) in '((1 2) (3 4) (5 6))
>          do (message "%d + %d = %d" x y (+ x y)) )
> 
> 1 + 2 = 3
> 3 + 4 = 7
> 5 + 6 = 11

Sure. If I look in my Common Lisp directory, I have 94 occurences
of `loop' there. Various complex things. But I try not to over
load things.

The `cl' library is now in "obsolete" directory and function
`cl-loop' is not obsolete. So I guess maybe you will not need
`require', it should work, it is now in `cl-macs.el'
file. Package describes it as extensions to Emacs Lisp for
compatibility reasons.

Same with `while':

(let ((list '((1 2) (3 4) (5 6))))
  (while list
    (let* ((pair (pop list))
           (x (car pair))
           (y (cadr pair)))
      (message "%d + %d = %d" x y (+ x y)))))

I would like above rather than this one below, as I don't seek CL
compatibility:

(cl-loop for (x y) in '((1 2) (3 4) (5 6))
         do (message "%d + %d = %d" x y (+ x y)))

Or with `mapc':

(mapc (lambda (pair)
        (let ((x (car pair))
              (y (cadr pair)))
          (message "%d + %d = %d" x y (+ x y))))
      '((1 2) (3 4) (5 6)))

And then benchmark:

(benchmark 100000000
           (let ((list '((1 2) (3 4) (5 6))))
             (while list
               (let* ((pair (pop list))
                      (x (car pair))
                      (y (cadr pair)))
                 (message "%d + %d = %d" x y (+ x y)))))) ⇒ "Elapsed time: 
5.520809s"

(benchmark 100000000
           (cl-loop for (x y) in '((1 2) (3 4) (5 6))
                    do (message "%d + %d = %d" x y (+ x y)))) ⇒ "Elapsed time: 
5.784922s"

(benchmark 100000000
           (let ()
             (mapc (lambda (pair)
                     (let ((x (car pair))
                           (y (cadr pair)))
                       (message "%d + %d = %d" x y (+ x y))))
                   '((1 2) (3 4) (5 6)))
             nil)) ⇒ "Elapsed time: 5.158536s"

I thint that benchmark says nothing much, the tests are vague and
they are about as fast. `while' is probably slowest.

`while' is giving me more clarity.

Yet your example still did not replace this function below, there
are no list of lists inside:

(defun outline-highlight-keywords ()
  (interactive)
  (let ((my-keywords '("TODO" hi-yellow
                       "DONE" hi-green
                       "URGENT" hi-red-b)))
    (while my-keywords
      (let ((keyword (pop my-keywords))
            (highlight (pop my-keywords)))
        (highlight-regexp keyword highlight)))))

-- 
Jean

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