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| author | Damien Cassou <damien@cassou.me> | 2022-09-04 13:21:59 +0200 |
|---|---|---|
| committer | Lars Ingebrigtsen <larsi@gnus.org> | 2022-09-04 13:21:59 +0200 |
| commit | 4751b51d5e1182975aa002af08a625e4859ec276 (patch) | |
| tree | 1dcabd8ede4a44d931d998dca9ddba21d2faa324 /doc/lispref | |
| parent | 4d50d413e67dd8ae183af8b68f315a667ebf2add (diff) | |
| download | emacs-4751b51d5e1182975aa002af08a625e4859ec276.tar.gz emacs-4751b51d5e1182975aa002af08a625e4859ec276.tar.bz2 emacs-4751b51d5e1182975aa002af08a625e4859ec276.zip | |
Add new function `seq-positions'
* doc/lispref/sequences.texi (Sequence Functions): Document it.
* lisp/emacs-lisp/seq.el (seq-positions): New function.
* lisp/emacs-lisp/shortdoc.el (sequence): Mention it.
* test/lisp/emacs-lisp/seq-tests.el (test-seq-positions): Test it
(bug#57548).
Diffstat (limited to 'doc/lispref')
| -rw-r--r-- | doc/lispref/sequences.texi | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/doc/lispref/sequences.texi b/doc/lispref/sequences.texi index 2ee19efb1a9..214b1e76e15 100644 --- a/doc/lispref/sequences.texi +++ b/doc/lispref/sequences.texi @@ -898,6 +898,27 @@ use instead of the default @code{equal}. @end example @end defun +@defun seq-positions sequence elt &optional testfn + This function returns a list of the (zero-based) indices of the +elements in @var{sequence} for which @var{testfn} returns +non-@code{nil} when passed the element and @var{elt} as +arguments. @var{testfn} defaults to @code{equal}. + +@example +@group +(seq-positions '(a b c a d) 'a) +@result{} (0 3) +@end group +@group +(seq-positions '(a b c a d) 'z) +@result{} nil +@end group +@group +(seq-positions '(11 5 7 12 9 15) 10 #'>=) +@result{} (0 3 5) +@end group +@end example +@end defun @defun seq-uniq sequence &optional function This function returns a list of the elements of @var{sequence} with |