JavaScript - The Beginner's Guide

Learn to declare and use variables in JavaScript with var, let, and const, and explore primitive data types such as strings, numbers, booleans, null, undefined, and non-primitive types like objects.

Master JavaScript conditional statements to control program flow with if, else if, and else. Explore nested conditions, logical operators, and switch cases through temperature and login examples.

Discover how loops in JavaScript automate repetitive tasks by executing code blocks under conditions, using for, while, do-while, and for-in iterations to handle numbers and object properties.

Define and reuse code with JavaScript functions by using the function keyword, name, and body to declare a function with optional parameters and call it multiple times.

Explore the three types of functions in JavaScript—named functions, anonymous functions, and arrow functions—covering syntax, parameters, return behavior, and how they affect scope and calls.

Explore JavaScript objects by declaring car objects with properties like make, model, year, and price, using object literals, dot and bracket notation, the new Object() constructor, and function constructors.

Learn how JavaScript uses the function keyword to declare classes with Pascal naming convention, and define properties like make, model, year, plus a get details method.

Explore JavaScript object properties by defining getters and setters, creating read-only and read/write properties, and manipulating values via get and set.

Discover how JavaScript prototypes attach to every function and object, enabling dynamic addition of properties and methods. Use car.prototype to share properties and implement method to retrieve details across instances.

Explore how closures let an inner function access variables from its outer function and the global scope, demonstrated with a Visual Studio Code counter example.

Explore JavaScript hoisting, where declarations are moved to the top, allowing functions and variables to be used before declaration; initialization happens later and function expressions differ.

Enable strict mode to enforce stricter JavaScript rules, catch undeclared variables, restrict deleting identifiers, prevent duplicate function parameters, and disallow octal literals, boosting code quality, security, and readability.

Learn how to select and update HTML content with JavaScript using getElementById, getElementsByClassName, and getElementsByTagName. Discover how to style and change text dynamically using querySelector and querySelectorAll with selectors.