lispdoc - results for count

(count item sequence &rest args &key from-end (start 0) (end nil) (key nil)
 (test #'eql test-p) (test-not nil test-not-p))
Function: Return the number of elements in SEQUENCE satisfying a test with ITEM, which defaults to EQL.
Example:
(defun count-difference (player board)
  "Count player's pieces minus opponent's pieces."
  (- (count player board)
     (count (opponent player) board)))
Mentioned in:
CLtL2 - 14.4. Searching Sequences for Items
CLtL2 - 26.12.2. Destructuring
CLtL2 - 26.3.2. Kinds of Loop Clauses
CLtL2 - 26.8. Value Accumulation
HyperSpec - 6.1.3.3 Examples of COUNT clause
HyperSpec - Function COUNT, COUNT-IF, COUNT-IF-NOT
On Lisp - Avoiding Capture by Prior Evaluation
On Lisp - New Utilities (Computation at Compile-Time)
PCL - sequence iterating functions
Successful Lisp - chapter13
(count-if pred sequence &rest args &key from-end (start 0) (end nil) (key nil))
Function: Return the number of elements in SEQUENCE satisfying PRED(el).
Example:
(defun length7 (list) (count-if #'true list))
Mentioned in:
HyperSpec - Function COUNT, COUNT-IF, COUNT-IF-NOT
Successful Lisp - chapter13
(count-if-not pred sequence &rest args &key from-end (start 0) (end nil)
 (key nil))
Function: Return the number of elements in SEQUENCE not satisfying TEST(el).
 Mentioned in:
HyperSpec - Function COUNT, COUNT-IF, COUNT-IF-NOT
Successful Lisp - chapter13
(hash-table-count hash-table)
Function: Return the number of entries in the given HASH-TABLE.
 Mentioned in:
CLtL2 - 16.1. Hash Table Functions
CLtL2 - 6.3. Equality Predicates
HyperSpec - Function HASH-TABLE-COUNT
(alexandria.0.dev:count-permutations n &optional (k n))
Function: Number of K element permutations for a sequence of N objects. K defaults to N