JS Tutorial

JS DATATYPES

JavaScript Data Types

In JavaScript, data types define the kind of value a variable can hold.

📌 Note: JavaScript is a dynamically typed language.

📦 1. Primitive Data Types

String – Textual data
Number – Integer or float
Boolean – true or false
Undefined – Declared but not assigned
Null – Intentionally empty
BigInt – Very large numbers
Symbol – Unique identifiers


let name = "John";

let age = 25;

let isStudent = true;

let score;

let empty = null;

let big = 12345678901234567890n;

let id = Symbol("id");

📦 2. Non-Primitive (Reference) Data Types

Object – Key-value pairs
Array – Ordered list
Function – Reusable code block


let person = { name: "Alice", age: 30 };

let fruits = ["apple", "banana"];

function greet() {
  return "Hello!";
}

🔍 Using `typeof`


console.log(typeof "Hello");

console.log(typeof 123);

console.log(typeof true);

console.log(typeof undefined);

console.log(typeof null);

console.log(typeof {});

console.log(typeof []);

console.log(typeof greet);

🧪 Try it Yourself

Result will appear here

📘 Summary:
JavaScript has primitive and non-primitive data types. Use typeof to identify them.

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