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Javascript has 6 primitive data type.
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Wrapper
Except for null and undefined, all primitive values have object equivalents that wrap around the primitive values. See Data Type - Boxing (Autoboxing|Autowrapping) and Primitive Wrapper
- String for the string primitive.
- Number for the number primitive.
- Boolean for the Boolean primitive.
- Symbol for the Symbol primitive.
The wrapper's valueOf() method returns the primitive value.