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6.1 The LOOP Facility 6.1.2 Variable Initialization and Stepping Clauses 6.1.2.1 Iteration Control 6.1.2.1.2 The for-as-in-list subclause
6.1.2.1.2.1 Examples of for-as-in-list subclause
;; Print every item in a list.
(loop for item in '(1 2 3) do (print item))
1
2
3
NIL
;; Print every other item in a list.
(loop for item in '(1 2 3 4 5) by #'cddr
do (print item))
1
3
5
NIL
;; Destructure a list, and sum the x values using fixnum arithmetic.
(loop for (item . x) of-type (t . fixnum) in '((A . 1) (B . 2) (C . 3))
unless (eq item 'B) sum x)
4
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