{You do not know js} close and objects. Simpson K.

No matter how programming on JavaScript you have, most likely you do not fully understand the language. This laconic, but at the same time deeply thoughtful leadership will introduce you to visibility areas, closing, keyword of this and objects - concepts that need to be known for more effective and productive programming on JS. You will learn how and why they work, and how clungs can become an effective part of your development tools. As in other books of the series “You do not know JS”, ​​non -trivial aspects of the language are considered here, from which JavaScript programmers prefer to stay away. Armed with this knowledge, you will achieve true skill JavaScript.

The book discusses the following topics:

• sets of rules used by the JavaScript engine to search for variables in the code;
• Investigated visibility areas;
• sets of containers for variables and functions;
• area of ​​visibility on the basis of functions and blocks, raising, as well as patterns and advantages of concealment based on visibility areas; < /Li>
• The use of closes to solve synchronous and asynchronous problems, including the creation of JavaScript libraries;
• Why is the reference of This indicates the objects depending on how the function is caused;
• nature JS objects - why you need to refer to them;
• Use of the Mixin pattern for classes;
• Transition from class design/inheritance to delegation of behavior;
• as a style of Oloo ( objects associated with other objects) naturally realizes the delegation of behavior.