JavaScript

Introduction to JavaScript

Variables, the DOM, and responding to events.

Variables & Data Types

let, const, and var; strings, numbers, booleans, null, undefined, and objects; typeof and type conversion.

Operators & Conditionals

Arithmetic, assignment, comparison, and logical operators; if/else, the ternary operator, and switch.

Loops

for, while, and do...while loops, break and continue, and for...of / for...in.

Strings, Numbers & Math

Template literals, string methods and search, number methods, and the Math object.

Functions

Declarations, expressions, and arrow functions; parameters, defaults, and return; scope, hoisting, and closures.

Arrays & Objects

Arrays and their methods (map, filter, reduce, find, sort), objects, properties, methods, this, and constructors.

Sets, Maps, Dates & JSON

Unique values with Set, key–value collections with Map, working with dates, and converting data to and from JSON.

DOM Manipulation

Selecting elements, changing text, attributes, classes, and styles, and creating and removing elements.

Events

addEventListener, common events, the event object, event delegation, and preventing default behavior.

Forms, Validation & Storage

Reading form values, handling submit, validating input, showing messages, and saving data with localStorage.

Errors & Debugging

Error types, try/catch/finally, throwing your own errors, the console, and breakpoints.

Async JavaScript & Promises

Timers, callbacks, promises, async/await, and fetching data from APIs.

Modern JavaScript (ES6+)

Destructuring, spread and rest, classes, optional chaining, modules, and iterators.