6.34.1 Predicates on hash tables

Function: mutable-hashtable? obj

Return #t if obj is a hash table and it is mutable; return #f otherwise. This function is different from the standard hashtable-mutable? because it does not raise an error if obj is not a hash table.

Function: hashtable-eq? obj

Function: hashtable-eqv? obj

Function: hashtable-equiv? obj

Return #t if obj is a hashtable object and it has, as equivalence function, respectively: eq?, eqv?, a user supplied function.