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The Common Lisp loop macro.
Documentation[syntax] (loop CLAUSE ...)
Executes the forms in CLAUSE ... repeatedly. Most loop features of CLtL2 (Common Lisp the Language, 2nd Edition) are provided. For more information see the Common Lisp Hyperspec.
(loop with a = 0 and b = -1 while (< a 10) sum a into foo do (set! a (+ a 1)) finally (return (list foo b))) ;=> (45 -1)
Copyright (C) 2002 Heinrich Taube (firstname.lastname@example.org) This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.