In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning.

Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "For example, to get started as quickly as possible, you can create a simple hello.go file anywhere you like and compile without issue."

A block of code is set as follows:

func Double(n int) int {

  if (n == 0) {
    return 0
  } else {
    return n * 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:

routes := mux.NewRouter()
  routes.HandleFunc("/page/{guid:[0-9a-zA\-]+}", ServePage)
  routes.HandleFunc("/", RedirIndex)
  routes.HandleFunc("/home", ServeIndex)
  http.Handle("/", routes)

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

export PATH=$PATH:/usr/local/go/bin

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "The first time you hit your URL and endpoint, you'll see We just set the value!, as shown in the following screenshot."