From 82ba818ff456bcd6d56a06226e3f27e98fbb55c3 Mon Sep 17 00:00:00 2001 From: Craig Jennings Date: Thu, 14 Aug 2025 22:58:58 -0500 Subject: removing all downloaded devdocs files --- devdocs/elisp/backquote.html | 39 --------------------------------------- 1 file changed, 39 deletions(-) delete mode 100644 devdocs/elisp/backquote.html (limited to 'devdocs/elisp/backquote.html') diff --git a/devdocs/elisp/backquote.html b/devdocs/elisp/backquote.html deleted file mode 100644 index 05a14e9b..00000000 --- a/devdocs/elisp/backquote.html +++ /dev/null @@ -1,39 +0,0 @@ -

Backquote

Backquote constructs allow you to quote a list, but selectively evaluate elements of that list. In the simplest case, it is identical to the special form quote (described in the previous section; see Quoting). For example, these two forms yield identical results: 

`(a list of (+ 2 3) elements)
-     ⇒ (a list of (+ 2 3) elements)
-
-
'(a list of (+ 2 3) elements)
-     ⇒ (a list of (+ 2 3) elements)
-
-

The special marker ‘,’ inside of the argument to backquote indicates a value that isn’t constant. The Emacs Lisp evaluator evaluates the argument of ‘,’, and puts the value in the list structure: 

`(a list of ,(+ 2 3) elements)
-     ⇒ (a list of 5 elements)
-
-

Substitution with ‘,’ is allowed at deeper levels of the list structure also. For example: 

`(1 2 (3 ,(+ 4 5)))
-     ⇒ (1 2 (3 9))
-
-

You can also splice an evaluated value into the resulting list, using the special marker ‘,@’. The elements of the spliced list become elements at the same level as the other elements of the resulting list. The equivalent code without using ‘`’ is often unreadable. Here are some examples: 

(setq some-list '(2 3))
-     ⇒ (2 3)
-
-
(cons 1 (append some-list '(4) some-list))
-     ⇒ (1 2 3 4 2 3)
-
-
`(1 ,@some-list 4 ,@some-list)
-     ⇒ (1 2 3 4 2 3)
-
- -
(setq list '(hack foo bar))
-     ⇒ (hack foo bar)
-
-
(cons 'use
-  (cons 'the
-    (cons 'words (append (cdr list) '(as elements)))))
-     ⇒ (use the words foo bar as elements)
-
-
`(use the words ,@(cdr list) as elements)
-     ⇒ (use the words foo bar as elements)
-
-

If a subexpression of a backquote construct has no substitutions or splices, it acts like quote in that it yields conses, vectors and strings that might be shared and should not be modified. See Self-Evaluating Forms.

-

- Copyright © 1990-1996, 1998-2022 Free Software Foundation, Inc.
Licensed under the GNU GPL license.
- https://www.gnu.org/software/emacs/manual/html_node/elisp/Backquote.html -

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