Maps and Filters on a dll

(dll-map map-function dll)

Apply map-function to all elements in the doubly linked list dll. The function is applied to the first element first.

(dll-map-reverse map-function dll)

Apply map-function to all elements in the doubly linked list dll. The function is applied to the last element first.

(dll-filter dll predicate)

Remove all elements in the doubly linked list dll for which predicate returns nil.

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