When to use a dictionary vs an array?

Q: When to use a dictionary vs an array?

This question evaluates understanding of data structures—arrays/lists versus dictionaries/hash maps—focusing on access patterns, time complexity for common operations, memory overhead, ordering and iteration characteristics.

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You’re implementing a feature and must choose between using an array/list or a dictionary/hash map to store and access data.

Explain when you would use an array/list vs when you would use a dictionary/hash map.

Cover:

Typical access patterns (lookup by index vs lookup by key)
Time complexity for common operations (lookup/insert/delete)
Memory overhead trade-offs
Ordering and iteration considerations
Examples of real use cases for each

When to use a dictionary vs an array?

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