Questions tagged [recursion]
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8 questions
2
votes
2
answers
289
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Is there a more idiomatic way of repeating a string in Emacs Lisp?
Is there a more idiomatic way to repeat a string in Emacs Lisp? I would define idiomacy as being both efficient in cpu/memory usage (given the task at hand), but also being efficient in terms of ...
- 108
-1
votes
2
answers
178
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Web scraping traversal using dom.el, pcase error: Unknown pattern
I would like to traverse the dom tree, extract the text and build a list after visiting each node.
Implementing the recursion with the help of text-tag function returned an unknown pattern error.
The ...
- 133
0
votes
1
answer
83
views
Text extraction after dom traversal returns empty
I would like to extract the text from each visited node but while traversing and build a list.
I only get an empty result.
Here is the following attempt using dom.el
(defun extract-text-from-dom (dom-...
- 133
3
votes
1
answer
353
views
“named-let” bug?
The following code seems fine semantically:
;; -*- lexical-binding: nil; -*-
(named-let f ((_ '(1)))
(dolist (paren-1-paren _)
(f ())))
Why does it throw an error?
(Is this a bug?
If so, I will ...
- 6,180
2
votes
1
answer
311
views
largest safe value of max-lisp-eval-depth
C-h v max-lisp-eval-depth:
You can safely make it considerably larger than its default value, if that proves inconveniently small.
Yes, I want it to be as large as possible.
However, the docstring ...
- 6,180
3
votes
2
answers
250
views
Simple recursive function freezes Emacs — how to correct the definition?
I was trying to familiarize myself with several languages by doing the advent of code exercises in these languages, and one that got me stuck is Emacs Lisp, in the very first exercise.
The goal is to ...
- 225
0
votes
0
answers
54
views
Mutually recursive bytecode function throws an error when I try to eval
The following workflow contains the steps needed to reproduce the error:
;; Byte-compile the function.
(byte-compile '(defun flatten (x)
(cl-labels ((rec (x acc)
...
- 650
0
votes
1
answer
178
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Having a hard time understanding some of Paul Graham's example code in his book “On Lisp” [closed]
https://sep.yimg.com/ty/cdn/paulgraham/onlisp.pdf On page 36 Paul introduces the following function:
(defun flatten (x)
(labels ((rec (x acc)
(cond ((null x) acc)
...
- 650