Use def!struct

[jscl.git] / src / list.lisp

diff --git a/src/list.lisp b/src/list.lisp
index 02d1984..7a4ca6d 100644 (file)
--- a/src/list.lisp
+++ b/src/list.lisp
@@ -263,3 +263,16 @@
        (3rd y 2nd))               ;3rd follows 2nd down the list.
       ((atom 2nd) 3rd)
     (rplacd 2nd 3rd)))
+
+
+(defun adjoin (item list &key (test #'eql) (key #'identity))
+  (if (member item list :key key :test test)
+    list
+    (cons item list)))
+
+(defun intersection (list1 list2 &key (test #'eql) (key #'identity))
+  (let ((new-list ()))
+    (dolist (x list1)
+      (when (member x list2 :test test :key key)
+        (push x new-list)))
+    new-list))