common-lisp LOOP, a Common Lisp macro for iteration Looping over Packages
Example
(loop for s being the symbols in 'cl
do (print s))
(loop for s being the present-symbols in :cl
do (print s))
(loop for s being the external-symbols in (find-package "COMMON LISP")
do (print s))
(loop for s being each external-symbols of "COMMON LISP"
do (print s))
(loop for s being each external-symbol in pack ;pack is a variable containing a package
do (print s))
