Web Reference: 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. 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. Aug 1, 2025 · As with almost every programming language, JavaScript treats various types of values differently. A string like “Hello world” is very different from a number like 42.
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