Data Types

Last Updated: 01 Oct 2025

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The type of data stored in a variable is called its data type. In JavaScript, Data Types are classified into two categories:

• Primitive Types
• Reference Types

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Primitive Types

Primitive types are immutable and cannot be changed once they are created.They store only a single value at a time.

• String
• Number
• Boolean
• Symbol

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Reference Types

Reference types are mutable and can be changed once they are created. They store multiple values at a time.

• Object
• Array
• Function

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