Book Image

Learn ECMAScript - Second Edition

By : MEHUL MOHAN, Narayan Prusty
Book Image

Learn ECMAScript - Second Edition

By: MEHUL MOHAN, Narayan Prusty

Overview of this book

Learn ECMAScript explores implementation of the latest ECMAScript features to add to your developer toolbox, helping you to progress to an advanced level. Learn to add 1 to a variable andsafely access shared memory data within multiple threads to avoid race conditions. You’ll start the book by building on your existing knowledge of JavaScript, covering performing arithmetic operations, using arrow functions and dealing with closures. Next, you will grasp the most commonly used ECMAScript skills such as reflection, proxies, and classes. Furthermore, you’ll learn modularizing the JS code base, implementing JS on the web and how the modern HTML5 + JS APIs provide power to developers on the web. Finally, you will learn the deeper parts of the language, which include making JavaScript multithreaded with dedicated and shared web workers, memory management, shared memory, and atomics. It doesn’t end here; this book is 100% compatible with ES.Next. By the end of this book, you'll have fully mastered all the features of ECMAScript!
Table of Contents (18 chapters)
Title Page

Chapter 6. Implementing the Reflect API

The Reflect API is used for object reflection (that is, inspecting and manipulating the properties of objects). Although ES5 already had APIs for object reflection, these APIs were not well organized and, on failure, used to throw an exception. The Reflect API is well organized and makes it easier to read and write code, as it doesn't throw exceptions on failure. Instead, it returns the Boolean value, representing if the operation was true or false. Since developers are adapting to the Reflect API for object reflection, it's important to learn this API in depth. In this chapter, we'll cover:

  • Calling a function with a given this value
  • Invoking a constructor with the prototype property of another constructor
  • Defining or modifying the attributes of the object properties
  • Enumerating the properties of an object using an iterator object
  • Retrieving and setting the internal [[prototype]] property of an object
  • A lot of other operations related to inspecting and manipulating...