Web Reference: A JavaScript variable can hold 8 types of data. 7 Primitive Data Types and 1 Object Data Type. The Object data type can hold many different object types. 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. Jul 7, 2025 · Understanding data types is crucial for writing efficient and error free JavaScript code. Primitive Data Types such as Number, String, Boolean, Undefined, Null, Symbol, and BigInt are immutable and form the basic units of data.
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