mapcar

(mapcar function list &rest more-lists)

Applies function to successive elements of the given lists and returns a new list of the results. With a single list, the function receives one element per call. When several lists are supplied, the function is called with one element from each list in parallel, and iteration stops at the end of the shortest list.

Each argument must be a list (nil, the empty list, is accepted); passing a non-list such as a string signals an error rather than silently returning nil. Use map to map over a string or vector.