Even if you already have experience with j & # 097; vascript, chances are you don't fully know the language. This book focuses on new features introduced in Ecmascript 6 (ES6), the latest version of the j & # 097; vascript.ES6 standard, which tells about the intricacies of the language that are unfamiliar to most programmers working on j & # 097; vascript. Armed with this knowledge, you will achieve genuine mastery; learn the new syntax; learn how to correctly use iterators, generators, modules and classes; Be more efficient with your data familiarize yourself with new APIs, such as Array, Object, Math, Number and String; expand the functionality of programs using meta-programming.