fukamachi / assoc-utils Goto Github PK
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Utilities for manipulating association lists.
(loop
for i in *long-list*
with sum = nil
do (if (assoc-utils:aget sum i)
(incf (assoc-utils:aget sum i))
(push (cons i 0) sum))
finally (return sum))
Would be nicer to be able to write
(loop
for i in *long-list*
with sum = nil
do (incf (assoc-utils:aget sum i 0))
finally (return sum))
It is common practice to have multiple entries in an alist with the same key. E.g. CLtL2 explicitly touts this as a feature:
Moreover, because the searching function assoc searches the a-list in order, new entries can ``shadow'' old entries
The order of keys should thus be maintained in alist=
, otherwise this function might e.g. return non-nil for '(("foo" . 1) ("foo" . 2))
and '(("foo" . 2) ("foo" . 1))
.
CL-USER> (defparameter *a* '((:a . 1) (:b . 2)))
*A*
CL-USER> (assoc-utils:delete-from-alist *a* :a)
((:B . 2))
CL-USER> *a*
((:A . 1) (:B . 2))
CL-USER> (assoc-utils:delete-from-alistf *a* :a)
((:B . 2))
CL-USER> *a*
((:B . 2))
CL-USER>
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