Published in April 13, the author is the famous Zakas, his other two book "JavaScript Advanced Programming" and "high-performance JavaScript" You must have heard or read.
The book focuses on coding styles and coding specifications, with a variety of tests (non-null, type, attribute, presence, prototype) and a few tips. Of course, it mentions the presence detection with in, because some special cases can be ruled out, such as the value itself as a pseudo-implant. But in fact, when we write the code, it's easy to use attribute detection, because in is always time-consuming. In addition, it took 40% of the space to explain automation. The first time I saw Foggy, this part of automation was basically skipped by me. Today, I found out the list of books, of course, now popular grunt →→
In a word, a good book is worth seeing more than once.
Write maintainable JavaScript [read]