ANSI Common Lisp 6 Iteration 6.1 The LOOP Facility 6.1.3 Value Accumulation Clauses
18.104.22.168 Examples of COLLECT clause
;; Collect all the symbols in a list.
(loop for i in '(bird 3 4 turtle (1 . 4) horse cat)
when (symbolp i) collect i)
(BIRD TURTLE HORSE CAT)
;; Collect and return odd numbers.
(loop for i from 1 to 10
if (oddp i) collect i)
(1 3 5 7 9)
;; Collect items into local variable, but don't return them.
(loop for i in '(a b c d) by #'cddr
collect i into my-list
finally (print my-list))