The procedures described in this section are the basic operations on hash tables. They provide the functionality most often needed by programmers. Subsequent sections describe other operations that provide additional functionality needed by some applications.
Associates datum with key in hash-table and returns an unspecified result.
The average time required by this operation is bounded by a constant. If there is no association for key , default is returned. The average time required by this operation is bounded by a constant. If hash-table has an association for key , removes it. Returns an unspecified result.