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"rule of thumb is: For a given value to be inserted, bucket must be UNIQUE & DERIVABLE FROM THE VALUE that it is supposed to STORE." - this describes a perfect hash function, which is usually only possible for a few hundred or thousand values known at compile time. Most hash tables have to handle collisions. Also, hash tables tend to allocate space for all buckets whether they're empty or not, whereas your pseudo-code documents a create_extra_space_for_bucket() step during insertion of new keys. Buckets may be pointers though.
– Tony Delroy
Commented Aug 31, 2017 at 3:54

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