Conventions

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: "This is because the main() function is where the program execution begins."

A block of code is set as follows:

package main 
 
import "fmt" 
import "os" 
 
func main() { 
   arguments := os.Args 
   for i := 0; i < len(arguments); i++ { 
         fmt.Println(arguments[i]) 
   } 
} 

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

package main 
 
import "fmt" 
import "os" 
 
func main() { 
   arguments := os.Args 
   for i := 0; i < len(arguments); i++ { 
         fmt.Println(arguments[i]) 
   } 
} 

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

$ go run hw.go
Hello World!  

New terms and important words are shown in bold.