Atharv Gyan

JavaScript is a powerful and versatile programming language that is essential to modern web development. Initially designed to make web pages interactive, it has grown to become a core component of the web, alongside HTML and CSS. Today, JavaScript not only runs in the browser but also on servers, mobile devices, and even robots. 1. What is JavaScript? JavaScript is a high-level, interpreted programming language known for its role in web development. Unlike languages that need to be compiled before running, JavaScript code can be written in a text file and run directly in a web browser or on a server using environments like Node.js. 2. Why Learn JavaScript? Ubiquity : JavaScript runs on nearly every device that has a web browser, making it one of the most universally deployed languages. Flexibility : JavaScript supports multiple programming paradigms, including object-oriented, imperative, and functional programming styles. Community and Resources : There is a vast community of develo...

Variables 1. Declaration var Historically, variables were declared using the var keyword. However, it has some scoping issues and is generally replaced by let and const in modern JavaScript. javascript var x = 10; let Introduced in ES6, let allows you to declare block-scoped variables. This means the variable is only available within the block it is defined. javascript let y = 20; const Also introduced in ES6, const is used to declare block-scoped variables that are read-only. Once a value is assigned to a const variable, it cannot be reassigned. javascript const z = 30; 2. Variable Scope Global Scope: Variables declared outside of any function or block are in the global scope and can be accessed from anywhere in the code. Function Scope: Variables declared within a function using var are confined to the function scope. Block Scope: Variables declared with let or const within a block (denoted by {}) are confined to that block. javascript if (true) {   var a = 40;  // global ...