CLCS
Function

length

length sequencen

Arguments and Values

sequencea proper sequence.
na 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