Emacs Lisp: The iota function for number ranges in Emacs Lisp
This is the iota function that I had to make today. I have shamelessly borrowed the description from Guile reference manual on iota function from SRFI-1 and tried to make it compliant. I guess this could be done more elegantly. For me is important that it gives me the same result as intended.
(iota 10) would evaluate to
(0 1 2 3 4 5 6 7 8 9).
(iota 10 1) would evaluate to
(1 2 3 4 5 6 7 8 9 10).
(iota 10 1 2) would evaluate to
(1 3 5 7 9 11 13 15 17 19).
The behavior is the same as in SRFI-1.
By using this
iota function I can generate the number range and then iterate over the list with the
dolist' function. I could then iterate with(dolist (num (iota 10 20)))` from the number 20 to number 29.
(defun iota (count &optional start step) "Return a list containing COUNT numbers, starting from START and adding STEP each time. The default START is 0, the default STEP is 1" (let* ((start (if start start 0)) (step (if step step 1)) (last (+ start count)) (counter 0) (list '()) (elt start)) (while (< counter count) (push elt list) (setq elt (+ elt step)) (setq counter (1+ counter))) (reverse list)))
iota is often used in Scheme programming language. Guile and other scheme implementations already have it, and I have got used to it. There probably exists in Emacs lisp equivalent function or somebody else already made it, but I do not know anything about it. I had to make it myself.
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