array-join

Join (SQL-like) two iterables by a common key. v4.0.0 is the current stable version, ESM-only, requires Node >=22. Provides INNER JOIN, LEFT JOIN, and FULL JOIN operations on iterables. The user supplies key extractors and a result constructor. v3 introduced a simplified interface and up to 10x performance improvement. v3 dropped custom match functions and made all parameters required. v4 dropped CJS support and raised minimum Node version. Key differentiator: lightweight, typed (TypeScript), and fast for object array joins without a database.