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JavaScript Tutorial

Variables to closures, promises, the DOM and OOP — a complete JS reference.

Map vs Set — Differences

Map stores key-value pairs; Set stores only unique values, with no keys.

Map — key → value pairs, like a more powerful plain object
Set — a collection of unique values, no duplicates allowed
Both preserve insertion order and have a .size property (not .length)
Both support any value type as elements/keys, including objects