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Another answer which uses simpler lisp-constructs than other answers here to step over the list (no throw/catch). (defun nth-elt (element xs) "Return zero-indexed position of ELEMENT in list XS, or nil if absent." (let ((index 0)) (while (and xs (not (equal element (car xs)))) (setq index (1+ index)) (setq xs (cdr xs))) (and ...


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