diff options
Diffstat (limited to 'lisp/emacs-lisp/map.el')
| -rw-r--r-- | lisp/emacs-lisp/map.el | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/lisp/emacs-lisp/map.el b/lisp/emacs-lisp/map.el index dea5b34991a..8c67d7c7a25 100644 --- a/lisp/emacs-lisp/map.el +++ b/lisp/emacs-lisp/map.el @@ -175,7 +175,17 @@ MAP can be an alist, plist, hash-table, or array." (cl-defgeneric map-delete (map key) "Delete KEY in-place from MAP and return MAP. -Keys not present in MAP are ignored.") +Keys not present in MAP are ignored. + +Note that if MAP is a list (either alist or plist), and you're +deleting the final element in the list, the list isn't actually +destructively modified (but the return value will reflect the +deletion). So if you're using this method on a list, you have to +say + + (setq map (map-delete map key)) + +for this to work reliably.") (cl-defmethod map-delete ((map list) key) ;; FIXME: Signal map-not-inplace i.s.o returning a different list? @@ -540,7 +550,7 @@ TYPE is a list whose car is `hash-table' and cdr a list of keyword-args forwarded to `make-hash-table'. Example: - (map-into '((1 . 3)) '(hash-table :test eql))" + (map-into \\='((1 . 3)) \\='(hash-table :test eql))" (map--into-hash map (cdr type))) (defun map--make-pcase-bindings (args) |