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. Mar 13, 2026 · JavaScript supports different data types to handle numbers, text, and other kinds of information. Variables: Declared using var, let, and const to store data values. Primitive Data Types: Includes Number, String, Boolean, Null, Undefined, BigInt, and Symbol. Non-Primitive Data Types: Includes Object, Array, and Function used to store complex data. 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.
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