Complete Guide to JavaScript 1. Introduction to JavaScript JavaScript is one of the core technologies of the web, alongside HTML and CSS. It was created by Brendan Eich in 1995 and has evolved into a powerful language used for both client-side and server-side development. Key Features of JavaScript: Interpreted : Runs directly in the browser without needing compilation. Dynamic Typing : Variables can hold any type of data. Event-Driven : Listens to user interactions and executes code accordingly. Supports Object-Oriented, Functional, and Procedural Programming. Asynchronous Processing : Handles concurrent tasks efficiently. 2. JavaScript Basics Variables and Data Types JavaScript supports three types of variable declarations: javascript var name = "John" ; // Function-scoped let age = 25 ; // Block-scoped const PI = 3.1416 ; // Immutable constant Common data types: String : "Hello" Number : 42 Boolean : true, false Array : [1, 2, 3] Object :...