JavaScript

Learn what JavaScript is, how to add it to a webpage, and run your first lines of code in the browser.

Store and work with data using var, let, and const. Learn strings, numbers, booleans, and more.

Use arithmetic, comparison, and logical operators to perform calculations and make decisions.

Control the flow of your program with if/else statements, ternary operators, and switch.

Repeat code efficiently using for loops, while loops, and for...of to iterate over data.

Write reusable blocks of code with function declarations, expressions, and arrow functions.

Work with ordered lists of data and transform them using map, filter, reduce, and more.

Store structured data in key-value pairs and use destructuring and spread to work with objects.

Select HTML elements from JavaScript and change their content, styles, and behavior.

Respond to user actions like clicks, keypresses, and form submissions using event listeners.

Build a fully interactive to-do app step by step — add, complete, and delete tasks with localStorage.