This is the assoc-utils Reference Manual, version 0.1, generated automatically by Declt version 4.0 beta 2 "William Riker" on Tue Jul 15 03:17:07 2025 GMT+0.
The main system appears first, followed by any subsystem dependency.
assoc-utilsUtilities for manipulating association lists
Eitaro Fukamachi
Public Domain
# Assoc-Utils
[](https://travis-ci.org/fukamachi/assoc-utils)
[](https://coveralls.io/r/fukamachi/assoc-utils)
[](http://quickdocs.org/assoc-utils/)
Utilities for manipulating association lists.
## Usage
### aget
“‘common-lisp
(defvar *person*
’(("name" . "Eitaro") ("email" . "e.arrows@gmail.com")))
(aget *person* "name")
;=> "Eitaro"
(aget *person* "address")
;=> NIL
(aget *person* "address" "Tokyo, Japan")
;=> "Tokyo, Japan"
(setf (aget *person* "name") "Eitaro Fukamachi")
*person*
;=> (("name" . "Eitaro Fukamachi") ("email" . "e.arrows@gmail.com"))
“‘
### alist-get
“‘common-lisp
(defvar *data*
’((:VERSION . "0.6")
(:GENERATOR . "openstreetmap-cgimap 2.0.1 (1992 spike-08.openstreetmap.org)")
(:COPYRIGHT . "OpenStreetMap and contributors")
(:ATTRIBUTION . "http://www.openstreetmap.org/copyright")
(:LICENSE . "http://opendatacommons.org/licenses/odbl/1-0/")
(:ELEMENTS
((:TYPE . "node") (:ID . 1) (:LAT . 42.79572) (:LON . 13.569003)
(:TIMESTAMP . "2024-09-13T11:52:01Z") (:VERSION . 39)
(:CHANGESET . 156568263) (:USER . "SomeoneElse_Revert") (:UID . 1778799)
(:TAGS (:|COMMUNICATION:MICROWAVE| . "yes") (:|COMMUNICATION:RADIO| . "fm")
(:DESCRIPTION . "Radio Subasio") (:FREQUENCY . "105.5 MHz")
(:MAN–MADE . "mast") (:NAME . "Monte Piselli - San Giacomo")
(:NOTE . "This is the very first node on OpenStreetMap.")
(:|TOWER:CONSTRUCTION| . "lattice") (:|TOWER:TYPE| . "communication"))))))
(alist-get *data* ’(:elements 0 :tags :note))
;=> "This is the very first node on OpenStreetMap."
“‘
### with-keys
The macro ‘with-keys‘ is the alist equivalent of [‘with-slots‘](https://novaspec.org/cl/f_with-slots).
“‘common-lisp
(with-keys
("name" (loc "location") (time "time" 2024))
(list (cons "name" "eitaro") (cons "location" "vienna"))
(declare (string name))
(setf loc (string-upcase loc))
(format nil "Hi, ~a in ~a around ~a!" name loc time))
;; => "Hi, eitaro in VIENNA around 2024!"
“‘
The first parameter is a list of keys that ‘with-keys‘ will reference in the alist
provided in the second parameter. ‘With-keys‘ will attempt to convert each
key into a symbol, binding the alist value to it during body execution.
If you don’t want ‘with-keys‘ to guess the symbol for a key, supply a list -
‘(symbol key)‘ - in place of the key, as in ‘(loc "location")‘ above.
If the key is a number, you have to supply a symbol name since common lisp
symbols can not consist of only numbers.
If you want to supply a default value, you have to supply a list -
‘(symbol key default)‘ - in place of the key, as in ‘(time "time" 2024)‘.
Code and documentation adapted from [cl-hash-util](https://github.com/orthecreedence/cl-hash-util).
### remove-from-alist & delete-from-alist
“‘common-lisp
(defvar *person*
’(("name" . "Eitaro") ("email" . "e.arrows@gmail.com")))
(remove-from-alist *person* "name")
;=> (("email" . "e.arrows@gmail.com"))
;; Destructive version
(delete-from-alist *person* "name")
;=> (("email" . "e.arrows@gmail.com"))
“‘
### alist-plist & plist-alist
“‘common-lisp
(defvar *person*
’(("name" . "Eitaro") ("email" . "e.arrows@gmail.com")))
(alist-plist *person*)
;=> (:NAME "Eitaro" :EMAIL "e.arrows@gmail.com")
(plist-alist ’(:name "Eitaro" :email "e.arrows@gmail.com"))
;=> (("name" . "Eitaro") ("email" . "e.arrows@gmail.com"))
“‘
### alist-hash & hash-alist
“‘common-lisp
(defvar *person*
’(("name" . "Eitaro") ("email" . "e.arrows@gmail.com")))
(alist-hash *person*)
;=> #<HASH-TABLE :TEST EQUAL :COUNT 2 {1004329443}>
(hash-alist *)
;=> (("name" . "Eitaro") ("email" . "e.arrows@gmail.com"))
“‘
### alist-keys & alist-values
“‘common-lisp
(defvar *person*
’(("name" . "Eitaro") ("email" . "e.arrows@gmail.com")))
(alist-keys *person*)
;=> ("name" "email")
(alist-values *person*)
;=> ("Eitaro" "e.arrows@gmail.com")
“‘
### alistp
“‘common-lisp
(alistp ’(("name" . "Eitaro") ("email" . "e.arrows@gmail.com")))
;=> T
(alistp 1)
;=> NIL
(alistp nil)
;=> T
;; Type: alist is also available
(typep ’(("name" . "Eitaro") ("email" . "e.arrows@gmail.com")) ’alist)
;=> T
“‘
### alist=
“‘common-lisp
(alist= ’(("name" . "Eitaro") ("email" . "e.arrows@gmail.com"))
’(("email" . "e.arrows@gmail.com") ("name" . "Eitaro")))
;=> T
“‘
## Installation
“‘common-lisp
(ql:quickload :assoc-utils)
“‘
## Author
* Eitaro Fukamachi (e.arrows@gmail.com)
## License
Assoc-Utils is free and unencumbered software released into the public domain.
0.1
src (module).
Modules are listed depth-first from the system components tree.
assoc-utils/srcassoc-utils (system).
assoc-utils.lisp (file).
Files are sorted by type and then listed depth-first from the systems components trees.
assoc-utils/assoc-utils.asdassoc-utils (system).
assoc-utils/src/assoc-utils.lispsrc (module).
*assoc-test* (special variable).
(setf aget) (setf expander).
aget (function).
alist (type).
alist-get (function).
alist-hash (function).
alist-keys (function).
alist-plist (function).
alist-values (function).
alist= (function).
alistp (function).
delete-from-alist (macro).
delete-from-alistf (macro).
hash-alist (function).
plist-alist (function).
remove-from-alist (function).
remove-from-alistf (macro).
with-keys (macro).
Packages are listed by definition order.
assoc-utilscommon-lisp.
*assoc-test* (special variable).
(setf aget) (setf expander).
aget (function).
alist (type).
alist-get (function).
alist-hash (function).
alist-keys (function).
alist-plist (function).
alist-values (function).
alist= (function).
alistp (function).
delete-from-alist (macro).
delete-from-alistf (macro).
hash-alist (function).
plist-alist (function).
remove-from-alist (function).
remove-from-alistf (macro).
with-keys (macro).
Definitions are sorted by export status, category, package, and then by lexicographic order.
The macro ‘with-keys‘ is the alist equivalent of ‘with-slots‘.
(with-keys
("name" (loc "location") (time "time" 2024))
(list (cons "name" "eitaro") (cons "location" "vienna"))
(declare (string name))
(setf loc (string-upcase loc))
(format nil "Hi, ~a in ~a around ~a!" name loc time))
;; => "Hi, eitaro in VIENNA around 2024!"
The first parameter is a list of keys that ‘with-keys‘ will reference in the alist
provided in the second parameter. ‘With-keys‘ will attempt to convert each
key into a symbol, binding the alist value to it during body execution.
If you don’t want ‘with-keys‘ to guess the symbol for a key, supply a list -
‘(symbol key)‘ - in place of the key, as in ‘(loc "location")‘ above.
If the key is a number, you have to supply a symbol name since common lisp
symbols can not consist of only numbers.
If you want to supply a default value, you have to supply a list -
‘(symbol key default)‘ - in place of the key, as in ‘(time "time" 2024)‘.
q
Code and documentation adapted from cl-hash-util.
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