Nondictionaries
A nondictionary is a data structure that represents a collection of values or elements but does not provide the direct key‑value mapping functionality that defines a traditional dictionary (hash map, associative array, or map). Instead, nondictionaries expose order or membership without storing explicit keys or descriptors for each element. Typical examples include lists, arrays, sets, and stacks. Each of these structures allows access, addition, or removal of elements, but the methods of accessing those elements differ from dictionary semantics.
In computer science, dictionaries are valued for quick lookup and insertion based on hashed keys. Nondictionaries
The concept of nondictionary structures is frequently discussed in the contexts of algorithm analysis and database