Questions tagged [apply]
The apply tag has no usage guidance.
14
questions
1
vote
1
answer
51
views
How can I apply function `max` to a list of numbers?
I want to find the max element in a list of numbers.
(setq l (list 1 2 3 4 5))
What is an easy way to call the max function on l?
So far I have this but this seems convoluted:
(eval `(max ,@l))
It ...
- 155
2
votes
2
answers
178
views
Call apply with a macro
Is there a way to expand a macro using a list of arguments? I tried using apply but then I get an error that the "function" my/x-becomes-nil is invalid.
(defmacro my/x-becomes-nil (variable ...
- 1,449
0
votes
1
answer
154
views
funcall/apply lambda
Please look at the following elisp expressions.
(funcall 'lambda '() 1)
;; or
(apply 'lambda '() 1 ())
The interpreter says that lambda is not a valid function for both the above expressions. Why? Is ...
- 227
2
votes
1
answer
80
views
Why can't I directly invoke the result of apply-partially?
I'm confused about return value of apply-partially. Documentation states that it returns a function, and source of the function shows that it actually retruns a lambda. But I can't invoke the return ...
- 237
0
votes
1
answer
76
views
Source C code of function 'apply'
I referenced C-h f apply for the source code of "apply", it prompts
References
C code is not yet loaded.
but does not hint the destination file.
Execute grep-find within Emacs repo thus return no ...
- 1,099
1
vote
1
answer
80
views
Use Elisp macro instead of two function arguments?
Is the following sort of shortcut macro possible to implement?
(defmacro region-end-beg ()
"Replacement for '(region-end) (region-begin)' in source code"
(...))
So that
(buffer-substring (region-...
- 11
2
votes
1
answer
632
views
Difference between apply and funcall
(describe-function apply) says:
apply is a built-in function in ‘src/eval.c’. ...
- 1,173
3
votes
1
answer
338
views
Rewriting `defadvice' as `advice-add' makes advice ineffective
I am trying to make undo-tree auto compress the history save file. The document suggests adding the following advice
(defadvice undo-tree-make-history-save-file-name
(after undo-tree activate)
(...
- 645
0
votes
1
answer
52
views
Apply of a logic function over a list
I'm trying to apply a logic function over a list, but:
e.g.(apply 'and some_list) give me Invalid function: and.
There is a way to apply a logical function to a list?
- 425
1
vote
1
answer
199
views
Return Value of apply-partially
I'm playing around with apply-partially and I'm confused about what gets returned when calling this function. The documentation states that apply-partially returns a function, but then I'd expect to ...
- 501
4
votes
2
answers
358
views
apply partially last arg
Is there something like apply-partially
(apply-partially FUN &rest ARGS)
Return a function that is a partial application of FUN to ARGS.
ARGS is a list of the first N arguments to pass to FUN.
...
- 175
2
votes
1
answer
86
views
Writing bytes to a file using library f.el [duplicate]
I'm trying to do something very simple, write bytes to a file using the f library:
(require 'f)
And I create a list of bytes:
(setq random-data (loop for i from 0 to 40 collect (random 150)))
So ...
- 541
0
votes
1
answer
94
views
How can I use a var to provide multiple arguments to a function? [duplicate]
Here is a simple example in which I would like to replace
(start-process "ls" "*temp*" "ls" "-l" "-a" "-t" "-r") ; this works
with
(setq some-var ????) ; <-- Need to figure this part out
(start-...
- 24.3k
2
votes
1
answer
364
views
turn a list into a set of arguments for a function [duplicate]
I have a defun get-quotes with one mandatory and 2 optional arguments. I would like to do something like this:
(let ((articles
'("/home/matt/art/mice.pdf" '("/home/matt/art/cats.pdf" "Smith, ...
- 105