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| ANSI Common Lisp 17 Sequences 17.3 Dictionary of Sequences
17.3.11 length | Function
  Syntax: length sequence n Arguments and Values: sequence - a proper sequence. n - a non-negative integer. Description: Returns the number of elements in sequence. If sequence is a vector with a fill pointer, the active length as specified by the fill pointer is returned. Examples:
       (length "abc")  3
       (setq str (make-array '(3) :element-type 'character
                                  :initial-contents "abc"
                                  :fill-pointer t))  "abc"
       (length str)  3
       (setf (fill-pointer str) 2)  2
       (length str)  2
Exceptional Situations: Should be prepared to signal an error of type type-error if sequence is not a proper sequence. See Also: list-length, sequence Allegro CL Implementation Details: None.

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