No matter how much experience you have with JavaScript, odds are you don’t fully understand the language. As part of the "You Don’t Know JS" series, this concise yet in-depth guide focuses on new asynchronous features and performance techniques—including Promises, generators, and Web Workers—that let you create sophisticated single-page web applications and escape callback hell in the process. Like other books in this series, You Don’t Know JS: Async & Performance dives into trickier parts of the language that many JavaScript programmers simply avoid. Armed with this knowledge, you can become a true JavaScript master. With this book you will: Explore old and new JavaScript methods for handling asynchronous programmingUnderstand how callbacks let third parties control your program’s executionAddress the "inversion of control" issue with JavaScript PromisesUse generators to express async flow in a sequential, synchronous-looking fashionTackle program-level performance with Web Workers, SIMD, and asm.jsLearn valuable resources and techniques for benchmarking and tuning your expressions and statements