hash-table-count

hash-table-count Function

Syntax:

hash-table-count hash-table → count

Arguments and Values:

hash-table—a hash table.

count—a non-negative integer .

Description:

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.

Examples:

(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 

Affected By:

clrhash, remhash, setf of gethash

See Also:

hash-table-size

Notes:

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)

Expanded Reference: hash-table-count

tip

TODO: Please contribute to this page by adding explanations and examples

(hash-table-count )