To get the most out of this book

You should have some programming experience and understand concepts such as variables, and functions. If you've never seen a line of JavaScript or C/C++ code, you may want to do some preliminary research before working through the examples in this book. I've chosen to use JavaScript ES6/7 features such as destructuring and arrow functions, so if you haven't worked with JavaScript in the last 3 - 4 years, the syntax may look slightly different.

Download the example code files

You can download the example code files for this book from your account at www.packtpub.com. If you purchased this book elsewhere, you can visit www.packt.com/support and register to have the files emailed directly to you.

You can download the code files by following these steps:

1. Log in or register at www.packt.com.
2. Select the SUPPORT tab.
3. Click on Code Downloads & Errata.
4. Enter the name of the book in the Search box and follow the onscreen instructions.

Once the file is downloaded, please make sure that you unzip or extract the folder using the latest version of:

• WinRAR/7-Zip for Windows
• Zipeg/iZip/UnRarX for Mac
• 7-Zip/PeaZip for Linux

The code bundle for the book is also hosted on GitHub at https://github.com/PacktPublishing/Learn-WebAssembly. In case there's an update to the code, it will be updated on the existing GitHub repository.

We also have other code bundles from our rich catalog of books and videos available at https://github.com/PacktPublishing/. Check them out!

Download the color images

We also provide a PDF file that has color images of the screenshots/diagrams used in this book. You can download it here: https://www.packtpub.com/sites/default/files/downloads/9781788997379_ColorImages.pdf.

Conventions used

There are a number of text conventions used throughout this book.

CodeInText: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "instantiate() is the primary API for compiling and instantiating WebAssembly code."

A block of code is set as follows:

int addTwo(int num) {
 return num + 2;
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

int calculate(int firstVal, int secondVal) {
return firstVal - secondVal;
}

Any command-line input or output is written as follows:

npm install -g webassembly

Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "You can do this by pressing the Start menu button, and right-clicking on the Command Prompt application and selecting Run as administrator."

Warnings or important notes appear like this.

Tips and tricks appear like this.