Learn JavaScript with uByte

Write your first JavaScript program, learn console.log, and understand how JS runs.

let, const, dynamic typing, typeof, string methods, and type conversion in JavaScript.

console.log, template literals, toFixed, and string building in JavaScript.

if/else, ternary, nullish coalescing, and switch in JavaScript.

for, while, for...of, and forEach in JavaScript.

Creating, slicing, mapping, and filtering arrays in JavaScript.

Plain objects, Map, and Set in JavaScript.

Function declarations, arrow functions, default params, and closures in JavaScript.

How JavaScript passes primitives by value and objects by reference.

ES6 classes, constructors, inheritance, and private fields in JavaScript.

Instance methods, static methods, getters, and setters in JavaScript.

Duck typing, mixins, and TypeScript interfaces in JavaScript.

try/catch/finally, Error types, and async error handling in JavaScript.

ES modules (import/export), CommonJS (require), and npm packages.

The event loop, Promises, async/await, and parallel execution in JavaScript.

Unit testing JavaScript with Jest — describe, it, expect.

Making HTTP requests with the fetch API and handling responses in JavaScript.

JSON.stringify, JSON.parse, and working with JSON data in JavaScript.

The JavaScript event loop, microtasks, and concurrent patterns.