It's easy to learn parts of j & # 097; vascript, but much harder to learn it completely or at a sufficient level - whether you're new to the language or have been using it for years. With the book in the "You Do not Know JS" series, you'll get a more complete understanding of j & # 097; vascript, including the more complex parts of the language that many experienced j & # 097; vascript programmers simply avoid.