Common Lisp the Language
2nd Edition
A loop is a series of expressions that are executed one or more times
a process known as iteration.
The Loop Facility defines a
variety of useful methods
indicated by
loop keywords
to iterate and to
accumulate values in a loop.
Loop keywords are not true Common Lisp keywords; they are symbols that
are recognized by the Loop Facility and that provide such capabilities
as controlling the direction of iteration
accumulating values inside
the body of a loop
and evaluating expressions that precede or follow
the loop body. If you do not use any loop keywords
the Loop Facility
simply executes the loop body repeatedly.
