JavaScript (Node.js) Interview: 200 Questions and Answers

The book "JavaScript (Node.js) Interview: 200 Questions and Answers" is a practical guide for developers preparing for a technical interview. The author has collected the most common and tricky questions asked in interviews at Russian and international IT companies and provided detailed, structured answers.

The book covers all key topics of modern JavaScript development and Node.js:

• JavaScript Basics: data types, closures, scope, hoisting, this, prototypal inheritance, ES6 classes.
• Asynchrony: callbacks, promises, async/await, Event Loop, microtasks and macrotasks, error handling.
• Node.js: module system (CommonJS, ESM), streams, buffers, file system operations, clustering, child_process, networking.
• Data Structures and Algorithms: arrays, linked lists, stack, queue, hash tables, trees, graphs, sorting, searching, recursion.
• Tools and Ecosystem: npm, package.json, bundlers (Webpack, Vite), linters, testing (Jest, Mocha), TypeScript.
• Advanced Topics: design patterns, performance optimization, security, database interaction (MongoDB, PostgreSQL), REST API, GraphQL.

Who is this book for?

• Junior developers who want to systematize their knowledge and confidently pass an interview.
• Middle developers planning to move to a higher level or change jobs.
• Students and course graduates preparing for their first technical interview.
• Team Leads and tech leads who want to refresh their knowledge and understand what questions to ask candidates.

What you will learn after reading:

• How the Event Loop works and why the order of console output might surprise you.
• How var, let, and const differ in terms of scope and hoisting.
• How to properly handle errors in asynchronous code.
• Which data structures to choose for solving a specific problem.
• How to optimize the performance of a Node.js application.
• How to pass a system design interview for a Node.js developer.

Each question is accompanied by a detailed explanation, code examples, and links to additional materials. The book is structured so you can study topics in any order — from the simplest to the most complex. This is not just a collection of answers, but a full-fledged textbook for preparing for a technical interview, which will help you not only remember the correct answers but also deeply understand the principles of JavaScript and Node.js.

Format: PDF, EPUB, MOBI. Available for download immediately after purchase. Perfect for reading on a computer, tablet, or e-reader.