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Showing content from https://www.lispworks.com/documentation/HyperSpec/Body/f_hash_t.htm below:

CLHS: Function HASH-TABLE-P

Syntax:

hash-table-p object => generalized-boolean

Arguments and Values:

object---an object.

generalized-boolean---a generalized boolean.

Description:

Returns true if object is of type hash-table; otherwise, returns false.

Examples:

 (setq table (make-hash-table)) =>  #<HASH-TABLE EQL 0/120 32511220>
 (hash-table-p table) =>  true
 (hash-table-p 37) =>  false
 (hash-table-p '((a . 1) (b . 2))) =>  false

Side Effects: None.

Affected By: None.

Exceptional Situations: None.

See Also: None.

Notes:

 (hash-table-p object) ==  (typep object 'hash-table)

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