Introduction

JavaScript is a versatile, high-level programming language commonly used in web development to create dynamic and interactive user experiences. It can be used for front-end and back-end development, making it an essential tool for modern web developers.

Setting Up

1. Browser Console: Open your web browser and access the console (usually found in Developer Tools).
2. Text Editor: Use any text editor like VSCode, Sublime Text, or even Notepad.

Basics

Variables

Variables are used to store data. You can declare variables using let, const, or var.

let name = "John";
const age = 30;
var isStudent = true;

Data Types

JavaScript supports various data types, including:

• String: "Hello"
• Number: 42
• Boolean: true or false
• Array: [1, 2, 3]
• Object: { key: "value" }
• Undefined: undefined
• Null: null

Functions

Functions are blocks of code designed to perform a particular task.

function greet() {
  console.log("Hello, World!");
}

greet(); // Output: Hello, World!

Control Structures

Conditional Statements

Used to perform different actions based on different conditions.

let time = 20;
if (time 




  
  
  Loops


Used to repeat a block of code a number of times.


for (let i = 0; i 




  
  
  Events


JavaScript can respond to events, like clicks or keyboard input.


Click me





  
  
  DOM Manipulation


JavaScript can interact with HTML elements to change content, style, and attributes.


This is a paragraph.
Change Text





  
  
  Arrays and Objects


Arrays and objects are used to store collections of data.


  
  
  Arrays




let fruits = ["Apple", "Banana", "Cherry"];
console.log(fruits[0]); // Output: Apple





  
  
  Objects




let person = {
  firstName: "John",
  lastName: "Doe",
  age: 30
};
console.log(person.firstName); // Output: John





  
  
  ES6 Features


Modern JavaScript (ES6 and later) introduces several new features:


  
  
  Arrow Functions




const add = (a, b) => a   b;
console.log(add(2, 3)); // Output: 5





  
  
  Template Literals




let name = "John";
console.log(`Hello, ${name}!`); // Output: Hello, John!





  
  
  Destructuring




let person = { firstName: "John", lastName: "Doe" };
let { firstName, lastName } = person;
console.log(firstName); // Output: John





  
  
  Conclusion


This is just a brief introduction to JavaScript. There's much more to explore, including advanced topics like asynchronous programming and API's ......

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