cl-loop and collect (was: Re: A more specific/targeted version of macroexpand-all?)

[Emanuel Berg <incal@dataswamp.org>]

Okamsn wrote:

> (cl-loop for i being the symbols
>          when (eq 'macro (car-safe (symbol-function i)))
>          collect i)

;;; -*- lexical-binding: t -*-
;;
;; this file:
;;   https://dataswamp.org/~incal/emacs-init/negative-subtraction.el

(require 'cl-lib)

(defun number-to-list (n)
  (cl-loop
    for d across (prin1-to-string n)
    collect (cl-digit-char-p d) ))
;; (number-to-list 1234) ; (1 2 3 4)

(defun negative-subtract (a b)
  (let*((a-nums (number-to-list a))
        (b-nums (number-to-list b)) )
    (cl-loop
      for i in a-nums
      for j in b-nums
      collect (- i j) )))
;; (negative-subtract 8888 7777) ; (1 1 1 1)

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