Web Reference: All JavaScript numbers are stored in a 64-bit floating-point format. JavaScript BigInt is a new datatype (ES2020) that can be used to store integer values that are too big to be represented by a normal JavaScript Number. Jul 8, 2025 · 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. 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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