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 · Variables are used to store data values that can be used and modified in a program. JavaScript supports different data types to handle numbers, text, and other kinds of information. Jul 8, 2025 · This chapter discusses JavaScript's basic grammar, variable declarations, data types and literals.
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