JavaScript has finally grown up. Armed with a slew of new features, JavaScript now makes writing the code that powers your applications elegant, concise, and easy to understand. This book is a pragmatic guide to the new features introduced in JavaScript, starting with Edition 6 of ECMAScript, and ending with Edition 9.  Using a "compare and contrast" approach, each chapter offers a deep dive into new features, highlighting how best to use them moving forward. As you progress through the book, you''ll be offered multiple opportunities to see the new features in action, and in concert with one another. Backed by an example-driven writing style, you''ll learn by doing, and get ready to embrace the new world of JavaScript.  What You''ll Learn Provide a deep exposition of the new features introduced in ES6 through ES9  Review how JavaScript''s new features by-pass any limitations of an existing approach Examine the refactoring necessary to go from old to new Demonstrate how JavaScript''s new features work in unison with each other  Who This Book Is For New and experienced developers who wish to keep abreast of the changes to JavaScript and deepen their understanding of the language.