Book Image

JavaScript for .NET Developers

By : Ovais Mehboob Ahmed Khan
Book Image

JavaScript for .NET Developers

By: Ovais Mehboob Ahmed Khan

Overview of this book

If you want to improve responsiveness or the UX in your ASP.NET applications, JavaScript can be a life saver. In an age where server-side operations have shifted to the client, being able to handle JavaScript with confidence and fluency is vital for ASP.NET developers. There’s no point trying to fight it, so start learning with this book. Make sure your projects exceed user expectations. Begin by getting stuck into the basics of JavaScript, and explore the language in the context of ASP.NET Core. You’ll then find out how to put the principles into practice, as you learn how to develop a basic ASP.NET application using Angular 2 and TypeScript. You’ll also develop essential skills required to develop responsive apps, with a little help from AJAX, ensuring that you’re building projects that can be easily accessed across different devices. With guidance on Node.js and some neat techniques to test and debug a range of JavaScript libraries in Visual Studio, you’ll soon be well on your way to combining JavaScript with ASP.NET in a way that’s capable of meeting the challenges of modern web development head-on.
Table of Contents (17 chapters)
JavaScript for .NET Developers
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Function arguments


We already know that the JavaScript functions can have parameters. However, the type of the parameters cannot be specified when creating a function. JavaScript neither performs any type checking on the parameter values passed nor validates the number of parameters when the function is called. So, for example, if a JavaScript function is taking two parameters, as shown in this code, we can even call it without passing any parameter value or by passing any type of the values or more values than the expected number of the parameters defined:

function execute(a, b) {
  //do something
}

//calling without parameter values
execute();

//passing numeric values
execute(1, 2);

//passing string values
execute("hello","world");

//passing more parameters
execute(1,2,3,4,5);

The missing parameters are set as undefined, whereas if more parameters are passed, these parameters can be accessed through the arguments object. The arguments object is a built-in object in JavaScript that contains...