You Don't Know JS: ES6 & Beyond

You Don't Know JS: ES6 & Beyond is the concluding Chinese-language volume of the "You Don't Know JS" series by American technical author Kyle Simpson. Translated by Shan Ye and published by Posts & Telecom Press in 2018, it belongs to the Turing Programming Series. The original series began as open-source notes on GitHub and focuses on the underlying mechanisms of JavaScript that many developers misunderstand or avoid. This volume actually contains two main parts. Part One, "Getting Started," is an introduction to the whole series: it begins with code, expressions, operators, values and types, variables, blocks, conditionals, loops, and functions, then moves on to objects, built-in type methods, value comparison, strict mode, immediately invoked function expressions, closures, this, prototypes, and the transitional "old and new" topics of polyfilling and transpiling, finally giving an overview of the themes of the later volumes. Part Two, "ES6 & Beyond," systematically sorts through the syntax and capabilities ES6 introduced: block-scoped declarations, spread/rest, default parameters, destructuring, object literal extensions, template literals, arrow functions, for..of, regular expression and Unicode extensions, and symbols; it then explains code organization through iterators and generators, asynchronous flow control driven by Promises and generators, collection types, new APIs, metaprogramming, and prospects for versions after ES6. The book is not long (about 260 pages), and its style is "break down first, then build up": it first points out common misconceptions, then provides underlying explanations and verifiable code examples, making it suitable for turning scattered experience into a system.