rassoc-if

(rassoc-if predicate alist)

Searches an association list and returns the first pair whose cdr satisfies predicate, or nil if none does. It is the mirror of assoc-if, which tests each pair's car, and the predicate form of rassoc. Each pair is tested with (funcall predicate (cdr pair)); non-cons elements of the list are skipped. The returned pair shares structure with the alist.