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
PacktPub.com
Contributors
Preface
Index

The Reflect object


The global Reflect object exposes all the new methods for object reflection. Reflect is not a function object; therefore, you cannot invoke the Reflect object. Also, you cannot use it with the new operator. All the methods of the Reflect API are wrapped in the Reflect object to make it look well organized.

The Reflect object provides many methods, which overlap with the global object's methods in terms of functionality. Let's see the various methods provided by the Reflect object for object reflection.

The Reflect.apply(function, this, args) method

The Reflect.apply() method is used to invoke a function with a given this value. The function invoked by Reflect.apply() is called as the target function. It's the same as the apply() method of the function object. The Reflect.apply() method takes three arguments:

  • The first argument represents the target function.
  • The second argument represents the value of this inside the target function. This argument is optional.
  • The third argument...