hash-table-count hash-table => count
Arguments and Values:
hash-table---a hash table.
count---a non-negative integer.
Returns the number of entries in the hash-table. If hash-table has just been created or newly cleared (see clrhash) the entry count is 0.
(setq table (make-hash-table)) => #<HASH-TABLE EQL 0/120 32115135> (hash-table-count table) => 0 (setf (gethash 57 table) "fifty-seven") => "fifty-seven" (hash-table-count table) => 1 (dotimes (i 100) (setf (gethash i table) i)) => NIL (hash-table-count table) => 100
Side Effects: None.
clrhash, remhash, setf of gethash
Exceptional Situations: None.
The following relationships are functionally correct, although in practice using hash-table-count is probably much faster:
(hash-table-count table) == (loop for value being the hash-values of table count t) == (let ((total 0)) (maphash #'(lambda (key value) (declare (ignore key value)) (incf total)) table) total)