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. Jan 19, 2026 · JavaScript data types define what kind of values a variable can hold and how those values behave in a program. They determine how data is stored in memory and how operations like comparison, calculation, and conversion work. Jul 9, 2024 · There are eight basic data types in JavaScript. Here, we’ll cover them in general and in the next chapters we’ll talk about each of them in detail. We can put any type in a variable. For example, a variable can at one moment be a string and then store a number:
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