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Questions tagged [funcall]

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How do I call a function within a lambda?

I would like to define a function that generates lambdas, as such: (defun my-func (FUNCTION) (lambda () (FUNCTION))) But when I evaluate the following (defun my-func1 () (message &...
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  • 288
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2 answers
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funcall inside local-set-key

Programming Perl in cperl-mode I often use _ symbol, so I decided to remap it with / symbol, so I could type faster. I created the following functions: (defun add-underscore () (interactive) (...
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2 votes
2 answers
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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 ...
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  • 1,429
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128 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 ...
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1 answer
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How to call a function that is the value of a variable?

Can someone explain to me why the code below throws an error (void-function fn)? (let ((lexical-binding t) (fn (lambda (y) (+ y 4))) (x 4)) (pcase x (10 (- x 2)) (4 (fn x)))) ...
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3 votes
1 answer
136 views

Inconsistent behavior when calling #'funcall with a macro

I would have thought that both of the funcall's the follow would have yielded the same result, but they don't and I'm trying to understand why. (defmacro test/z () "z") (funcall (function test/z)) ;;...
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1 vote
2 answers
28 views

Function within a function produces side-effect but failes to deliver logic test

This is a simple logic test that makes use of down-list and asks if another nested pair of parenthesis exits or not. (not (eql (point) (progn (ignore-errors (down-list)) (point))...
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1 answer
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Why funcall doesn't work from a closure

I'm having difficulty to call a function passed as an argument. Why the following snippet doesn't work, and how can I make it work? lexical-binding is set to t (defun on-success (data) (print "...
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  • 1,073
1 vote
1 answer
42 views

Evaluate allows for combinations whose operators are compound expressions

I find the amazing power of scheme in sicp Exercise 1.4. Observe that our model of evaluation allows for combinations whose operators are compound expressions. Use this observation to describe ...
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1 vote
2 answers
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I want to simplify repeated calls in my init.el file

I've got a lot of: (desktop-save-mode 1) (show-paren-mode 1) which I'd like to collapse into: (mapcar (lambda (fn) (fn 1)) '(desktop-save-mode show-paren-mode)) but I get an error: Symbol’s ...
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  • 105
2 votes
1 answer
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Difference between apply and funcall

(describe-function apply) says: apply is a built-in function in ‘src/eval.c’. ...
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0 votes
0 answers
129 views

Defining function that takes funciton as argument results in "Wrong type argument: commandp, (bm-my bm-next)"

When using the below and invoking the function via <leader>Bn I get an error of command-execute: Wrong type argument: commandp, (bm-my bm-next) (defun bm-my (a) (interactive) (a) (bm-show-...
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1 vote
1 answer
150 views

function that takes a function as argument and returns a new function

I'd like to write an elisp-function that has a function as argument and returns a new function. Let's say the new function double-the-function should write the returned value of the argument-function ...
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  • 316
4 votes
2 answers
194 views

Calling a function with a shorter but unknown argument signature length

Is there a terse idiomatic way of calling a function in the manner of funcall (dereferencing function symbols) when that function may have a variably shorter function signature? Say for example: a ...
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