zl:1 - FTP

zl:memass 346
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parison instead of eq. (zl:mem 'eq a b) is the same as (zl:memq a b).
(zl:mem 'equal a b) is the same as (zl:member a b).
zl:mem is usually used with equality predicates other than eq and zl:equal,
such as =, char-equal or zl:string-equal. It can also be used with noncommutative
predicates. The predicate is called with item as its first argument
and the element of list as its second argument, so:
(zl :mem #'< 4 list)
fmds the first element in list for which « 4 x) is true; that is, it finds the
first element greater than 4.
For a table of related items: See the section "Functions for Searching
Lists" in Symbolics Common Lisp: Language Concepts.
zl:memass predicate item alist Function
(zl:memass item alist) looks up item in the association list (list of conses)
alist. The value returned is the portion of the list beginning with the pair
containing the first element that matches item, according to predicate, or
nil if there is none such.
(car (zl:memass x y z» = (zl:ass x y z).
See the function zl:mem, page 345. As with zl:mem, you can use noncommutative
predicates; the first argument to the predicate is item and the
second is the key of the element of alist.
For a table of related items: See the section "Functions That Operate on
Association Lists" in Symbolics Common Lisp: Language Concepts.
member item list &key (test #'eql) test-not (key #'identity) Function
. member searches list for an element that satisfies the predicate specified
by the :test keyword with respect to item. If no element is found that
matches item, nil is returned; otherwise the tail of list beginning with the
first element that satisfied the predicate is returned. The keywords are:
:test
:test-not
:key
Any predicate specifying a binary operation to be applied
to a supplied argument and an element of a target list.
The item matches the specification only if the predicate
returns t. If :test is not supplied the default operation is
eql.
Similar to :test, except the item matches the specification
only if there is an element of the list for which the
predicate returns nil.
If not nil, should be a function of one argument that will
extract from an element the part to be tested in place of
the whole element.