Web Reference: Jul 8, 2025 · Programming languages all have built-in data structures, but these often differ from one language to another. This article attempts to list the built-in data structures available in JavaScript and what properties they have. These can be used to build other data structures. A JavaScript variable can hold 8 types of data. 7 Primitive types or an Object type. This guide explores each type in depth, explains how JavaScript's dynamic type system works, and covers the critical difference between how primitives and objects are stored in memory.
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