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."