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JavaScript

Set

Definition

A built-in collection that stores unique values of any type. Duplicate values are automatically ignored. Sets provide O(1) add/delete/has operations and are useful for deduplication.

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Related Terms

Map

A built-in collection that stores key-value pairs where keys can be any type (not just strings). Maps maintain insertion order and provide O(1) lookup. Unlike plain objects, Maps don't have prototype pollution concerns.

Array Methods

Built-in methods on the Array prototype for transforming and querying arrays. Key methods include map (transform each element), filter (select elements), reduce (accumulate), find (first match), some/every (boolean tests), and sort.