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Begin supporting list/index

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This currently doesn't work and as such is a work-in-progress.
This commit is contained in:
William Carroll 2020-01-20 10:16:35 +00:00
parent 0c59df8327
commit 64cf4ac920
1 changed files with 22 additions and 0 deletions
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22
configs/shared/.emacs.d/wpc/list.el
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@ -124,6 +124,28 @@
"Return over `XS' calling `F' on an element in `XS'and `ACC'." "Return over `XS' calling `F' on an element in `XS'and `ACC'."
(-reduce-from (lambda (acc x) (funcall f x acc)) acc xs)) (-reduce-from (lambda (acc x) (funcall f x acc)) acc xs))
;; TODO: Support this. It seems like `alist/set' is not working as I expected it
;; to. Perhaps we should add some tests to confirm the expected behavior.
;; (cl-defun list/index (f xs &key (transform (lambda (x) x)))
;; "Return a mapping of F applied to each x in XS to TRANSFORM applied to x.
;; The TRANSFORM function defaults to the identity function."
;; (->> xs
;; (list/reduce (alist/new)
;; (lambda (x acc)
;; (let ((k (funcall f x))
;; (v (funcall transform x)))
;; (if (alist/has-key? k acc)
;; (setf (alist-get k acc) (list v))
;; (setf (alist-get k acc) (list v))))))))
;; (prelude/assert
;; (equal '(("John" . ("Cleese" "Malkovich"))
;; ("Thomas" . ("Aquinas")))
;; (list/index (lambda (x) (plist-get x :first-name))
;; '((:first-name "John" :last-name "Cleese")
;; (:first-name "John" :last-name "Malkovich")
;; (:first-name "Thomas" :last-name "Aquinas"))
;; :transform (lambda (x) (plist-get x :last-name)))))
(defun list/map (f xs) (defun list/map (f xs)
"Call `F' on each element of `XS'." "Call `F' on each element of `XS'."
(-map f xs)) (-map f xs))