remhash key hash-table → generalized-boolean

key — an object.

hash-table — a hash table.

generalized-boolean — a generalized boolean.

Removes the entry for key in hash-table, if any. Returns true if there was such an entry, or false otherwise.

(setq table (make-hash-table)) → #<HASH-TABLE EQL 0/120 32115666> 
(setf (gethash 100 table) "C") → "C" 
(gethash 100 table) → "C", true 
(remhash 100 table) → true 
(gethash 100 table) → NIL, false 
(remhash 100 table) → false

The hash-table is modified.