Set-vs-Map.md

Feature	Set	Map
Purpose	Stores unique values	Stores key–value pairs
Duplicate values?	❌ Not allowed	✅ Keys must be unique, but values can repeat
Access by key	❌ No keys, only values	✅ Direct access via key
Order guaranteed?	✅ Insertion order preserved	✅ Insertion order preserved
Data type allowed	Any type (object, number, etc.), but only values	Any type for both keys and values
Useful for	Deduplication, quick existence checks	Dictionaries, lookups, caching