How Many Value Types Exist in JavaScript?

JavaScript has 8 primitive value types:

1. Undefined：A variable with no assigned value has the type undefined. For example: let x;
2. Null：The type representing the absence of a value. For example: let x = null;
3. Boolean：The boolean type has two values: true and false. For example: let x = true;
4. String：The type used for textual data. For example: let x = 'hello world';
5. Number：The type used for representing integers and floating-point numbers. For example: let x = 3.14;
6. BigInt：A type used for storing and manipulating integers of arbitrary size. For example: let x = 9007199254740991n;
7. Symbol：A unique and immutable data type. For example: let x = Symbol('hi');
8. Object：The object data type is used for storing complex data structures. For example: let x = {firstName:"John", lastName:"Doe"};

These 8 types can be broadly categorized into two types:

• Primitive values (Undefined, Null, Boolean, Number, String, Symbol, BigInt)
• Object values (Object)