This is the book "JavaScript Primer - An Introductory Book to Avoid Getting Lost." Author: azu / Takashi Inatomi Publisher: ASCII DWANGO (KADOKAWA) Price: 3,800 yen (excluding tax) [Contents] This is a standard introductory book that broadly covers JavaScript basics, asynchronous processing (Promise / Async・Await), classes, modules, JSON, and Node.js. The structure emphasizes "why things happen the way they do," making it suitable for self-study and review. [Condition] ・Used book ・Slight scratches and minor imperfections on the front and back covers (see photos) ・No writing or tears inside; no problem with reading ・Pages open well Please understand that this is a used item before purchasing. Instant purchase is OK.