Other Hash Table Functions

Here are some other functions for working with hash tables.

Function: hash-table-p table

This returns non-nil if table is a hash table object.

Function: copy-hash-table table

This function creates and returns a copy of table. Only the table itself is copied—the keys and values are shared.

Function: hash-table-count table

This function returns the actual number of entries in table.

Function: hash-table-contains-p key table

This returns non-nil if there is an association for key in table.

Function: hash-table-test table

This returns the test value that was given when table was created, to specify how to hash and compare keys. See make-hash-table (see Creating Hash Tables).

Function: hash-table-weakness table

This function returns the weak value that was specified for hash table table.

Function: hash-table-size table

This returns the current allocation size of table. Since hash table allocation is managed automatically, this is rarely of interest.