This book contains questions covering JavaScript syntax, rules, functionality, and theory. It is designed to help you improve upon your JavaScript knowledge as well as expose you to some edge cases and unusual situations in JavaScript. I find that these are the types of examples that really solidify a developer's understanding of this fun language.The book has a few questions specific to JavaScript running in the browser, but most questions are agnostic of environment. A few questions also include TypeScript, but they will be designated as such. The book is organized into 4 "tests", and the answers to the questions are in the back of the book.***BONUS*** Two additional links in the book link to Medium.com articles that provide another 50 JavaScript interview questions and 50 TypeScript interview questions. Altogether this means 400 interview questions!