When to use Struct?

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A useful comparison of structs and maps is made in When to Use Structs, String-keyed Maps, and Atom-keyed Maps.

It lists six rules governing the best practice usage of these data structures.

1. Always Use String-Keyed Maps for External Data.
2. Convert External Data to Structs ASAP.
3. Use Structs in All Other Code.
4. Use Structs for Output Data.
5. Avoid Using Atom-keyed Maps That Aren’t Structs.
6. Use Keyword Lists Only for Function Arguments