Evaluates n and then form, returning as its only value the nth value yielded by form, or nil if n is greater than or equal to the number of values returned by form. (The first returned value is numbered 0
.)
(nth-value 0 (values 'a 'b))
→A
(nth-value 1 (values 'a 'b))
→B
(nth-value 2 (values 'a 'b))
→(let* ((x 83927472397238947423879243432432432) (y 32423489732) (a (nth-value 1 (floor x y))) (b (mod x y))) (values a b (= a b)))
→3332987528 3332987528 true
None.
None.
None.
Operationally, the following relationship is true, although nth-value might be more efficient in some implementations because, for example, some consing might be avoided.
(nth-value n form) ≡ (nth n (multiple-value-list form))
\issue{NTH-VALUE:ADD}