17.3.11 length [Function]

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