This book has only one goal to provide you with the information you need to create full JavaScript applications that are simple to develop and maintain. This book isn’t meant to teach you how to use JavaScript. Instead, it’s meant to expand on what you already know by discussing JavaScript features and approaches. Over time, this will make your code easier to deal with. Normally, as an application matures, it becomes more complex. Adding new features and fixing bugs gets increasingly challenging. Your code is transformed into. It’s very inflexible and brittle, and even little changes may need a lengthy refactoring. If you’re interested in learning more about your code will remain adaptable and resilient if you follow the patterns recommended in this book. Changes to one piece of code will not have an adverse effect on another. Although this book will mostly focus on client-side design, it will also cover server-side subjects such as basic RESTful APIs and Node. The current trend is for a large portion of the application functionality to be pushed to the client. Things like scripting and connectivity with vendor services used to be handled by the server environment. It’s now typical to complete both of these tasks within the browser.


JavaScript is a dynamic programming language that’s used for a variety of purposes, including web development, web apps, game creation, and more. It enables you to add dynamic features to web sites that you couldn’t do with just HTML and CSS.

Why use JavaScript over other programming languages?

There are many reasons for web developers to use JavaScript over other programming languages: JavaScript is the only programming language native to the web browser, JavaScript is the very important, popular and useful there’s a low threshold to get started, and it’s a fun language to learn.

Why Do We Need JavaScript?

JavaScript can be found all throughout the Internet; there is no way to avoid it. In reality, JavaScript is used to display the contents of this web page in a variety of ways. The comments box on our blog, for example, is driven by JavaScript; when you click to post a comment, a JavaScript code is executed. We’ll show you some examples of companies that use JavaScript to assist you better grasp how it’s employed. PayPal has used JavaScript since its inception, Walmart’s web service was built on the Java programming language, and Facebook, the social media behemoth, uses JavaScript in its initiatives.

Topics you are going to cover in this book:

  • In first three chapter we will study about JavaScript revolution, functions as well as objects in which we discuss syntax of JavaScript, infrastructure, function polymorphism, function scope as well as objects prototypes etc.

  • In next three chapters we discuss Modules, separation of concerns as well as access control of JavaScript in which we discuss principle of Modularity, Module Patterns, and Module management, Model View Controller as well as Authentication and Authorization etc.

  • In last three chapter we study about Logging, Building Restful APIs and feature Toggle in which we discuss debugging, security, organization features, life span of feature etc.

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