Web Development - HTML, CSS &… on Telegram: “✅ JavaScript Basics

✅ JavaScript Basics – Part 1: Variables, Data Types & Operators 🧠📜

1️⃣ Variables in JavaScript
Variables store data. In modern JS, we use let and const.

let age = 25;          // Can be changed
const name = "Riya";   // Cannot be changed

📝 Use let when the value will change, const when it won’t.

2️⃣ Data Types
JavaScript is dynamically typed.

let name = "John";        // String  
let age = 30;             // Number  
let isOnline = true;      // Boolean  
let score = null;         // Null  
let x;                    // Undefined  
let user = {name: "Ali"}; // Object  
let colors = ["red", "blue"]; // Array

3️⃣ Type Checking

console.log(typeof age);      // "number"  
console.log(typeof name);     // "string"

4️⃣ Operators in JavaScript

Arithmetic Operators:

let x = 10, y = 3;
console.log(x + y); // 13  
console.log(x % y); // 1  
console.log(x ** y); // 1000

Assignment Operators:

x += 5; // same as x = x + 5  
x *= 2;

Comparison Operators:

console.log(x > y);     // true  
console.log(x === 10);  // true  
console.log(x !== y);   // true

Logical Operators:

let a = true, b = false;
console.log(a && b); // false  
console.log(a || b); // true
console.log(!a);     // false

✅ Practice Task:
1. Create 3 variables: name, age, isStudent
2. Print them using console.log()
3. Use arithmetic operators to perform basic math
4. Try typeof on each variable

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