Javascript-Fundamentals

Hello World in JavaScript

Every programming journey starts with Hello World. JavaScript makes this remarkably simple - just one line using the console.log() function.

The Code

Create a file named hello.js:

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console.log( …

Variables and Types in JavaScript

JavaScript is a dynamically and weakly typed language — you never declare a type for a variable, and values can be implicitly coerced between types. This flexibility makes JavaScript approachable but …

Operators in JavaScript

Operators are the building blocks of expressions in JavaScript. They let you do arithmetic, compare values, combine boolean conditions, and assemble strings. As a dynamically and weakly typed …

Control Flow in JavaScript

Control flow is how a program decides what to do and how many times to do it. Without it, code would simply run top to bottom with no branching or repetition. JavaScript gives you a familiar, …

Functions in JavaScript

Functions are the heart of JavaScript. As a multi-paradigm language with strong functional roots (it was originally meant to embed Scheme), JavaScript treats functions as first-class values - they can …

I/O Operations in JavaScript

Input and output are how a program talks to the outside world - the terminal, the keyboard, and the filesystem. In the browser, JavaScript’s “I/O” is the DOM and the network. On the …