Q203- What are the different data types in JavaScript?

JavaScript has 8 main data types, divided into primitive and non-primitive (reference) types.

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1️⃣ Primitive Data Types

These are immutable and stored by value.

1. String – Represents textual data.

   let name = "Teekam";
   

2. Number – Represents integers and floating-point numbers.

   let age = 25;
   let price = 99.99;
   

3. Boolean – Represents true or false.

   let isLoggedIn = true;
   

4. Undefined – A variable declared but not assigned a value.

   let x; // undefined
   

5. Null – Represents an intentional absence of value.

   let empty = null;
   

6. Symbol – Unique and immutable value, often used as object keys.

   let id = Symbol("id");
   

7. BigInt – Used for integers larger than the safe number limit.

   let bigNumber = 12345678901234567890n;
   

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2️⃣ Non-Primitive (Reference) Data Type

Stored by reference (not by value).

1. Object – Used to store collections of data or complex entities.

   let user = { name: "Teekam", age: 25 };
   

Includes:

• Array → let arr = [1, 2, 3];
• Function → function greet() { return "Hi"; }

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💡 In Short:

JavaScript data types are —
Primitive: String, Number, Boolean, Undefined, Null, Symbol, BigInt
Non-Primitive: Object (includes arrays & functions).