Primitives

In JavaScript, a primitive (primitive value, primitive data type) is data that is not an object and has no methods or properties. There are 7 primitive data types: string, number, bigint, boolean, undefined, symbol, and null.

Autoboxing

Due to a feature known as "autoboxing", JavaScript primitives appear to have methods and properties. What actually happens is that a wrapper object associated with the primitive is automatically accessed instead. Except for null and undefined, all primitive values have object equivalents that wrap around the primitive values:

• String for the string primitive.
• Number for the number primitive.
• BigInt for the bigint primitive.
• Boolean for the boolean primitive.
• Symbol for the symbol primitive.

The wrapper's valueOf() method returns the primitive value.

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Backlinks

• Arrays
• Data Types
• string
• Function Declaration
• const