Book Image

Object-Oriented JavaScript - Third Edition

By : Ved Antani, Stoyan STEFANOV
5 (1)
Book Image

Object-Oriented JavaScript - Third Edition

5 (1)
By: Ved Antani, Stoyan STEFANOV

Overview of this book

JavaScript is an object-oriented programming language that is used for website development. Web pages developed today currently follow a paradigm that has three clearly distinguishable parts: content (HTML), presentation (CSS), and behavior (JavaScript). JavaScript is one important pillar in this paradigm, and is responsible for the running of the web pages. This book will take your JavaScript skills to a new level of sophistication and get you prepared for your journey through professional web development. Updated for ES6, this book covers everything you will need to unleash the power of object-oriented programming in JavaScript while building professional web applications. The book begins with the basics of object-oriented programming in JavaScript and then gradually progresses to cover functions, objects, and prototypes, and how these concepts can be used to make your programs cleaner, more maintainable, faster, and compatible with other programs/libraries. By the end of the book, you will have learned how to incorporate object-oriented programming in your web development workflow to build professional JavaScript applications.
Table of Contents (25 chapters)
Object-Oriented JavaScript - Third Edition
About the Authors
About the Reviewer
Customer Feedback
Built-in Functions
Regular Expressions

ES6 addition to objects

ES6 has a few interesting object definition and property syntax. This new syntax is to make working with objects easier and concise.

Property shorthand

ES6 provides a shorter syntax for common object definition.

ES5: obj = { x: x, y: y };

ES6: obj = {x,y};

Computed property names

It is possible to compute property names in the new ES6 object definition syntax:

    let obj = { 
      foo: "bar", 
      [ "baz" + q() ]: 42 

Here the property name is computed where "baz" is concatenated with the result of the function call.


The Object.assign() method is used to copy the values of all enumerable own properties from one or more source objects to a target object:

    var dest  = { quux: 0 } 
    var src1 = { foo: 1, bar: 2 } 
    var src2 = { foo: 3, baz: 4 } 
    Object.assign(dst, src1, src2)