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Learn ECMAScript

You're reading from   Learn ECMAScript Discover the latest ECMAScript features in order to write cleaner code and learn the fundamentals of JavaScript

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Product type Paperback
Published in Feb 2018
Publisher
ISBN-13 9781788620062
Length 298 pages
Edition 2nd Edition
Languages
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Authors (2):
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Narayan Prusty Narayan Prusty
Author Profile Icon Narayan Prusty
Narayan Prusty
MEHUL MOHAN MEHUL MOHAN
Author Profile Icon MEHUL MOHAN
MEHUL MOHAN
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Toc

Table of Contents (14) Chapters Close

Preface 1. Getting Started with ECMAScript FREE CHAPTER 2. Knowing Your Library 3. Using Iterators 4. Asynchronous Programming 5. Modular Programming 6. Implementing the Reflect API 7. Proxies 8. Classes 9. JavaScript on the Web 10. Storage APIs in JavaScript 11. Web and Service Workers 12. Shared Memory and Atomics 13. Other Books You May Enjoy

Proxies in a nutshell

A proxy acts like a wrapper for an object and defines the custom behavior for the fundamental operations on the object. Some fundamental operations on the objects are property lookup, property assignment, constructor invocation, enumeration, and so on.

Think of it as a basic way of intercepting the operation you do with an object and its associated properties. For example, calling out a property value by writing <objectname>.propertyName should technically just echo out the property value, right?

What if you want to take a step back and inject your control right before the echoing part, but right after the calling part? Here's where proxies come in.

Once an object is wrapped using a proxy, all the operations that are supposed to be done on the object should now be done on the proxy object, so that the custom behavior can take place.

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