Mastering Go - Second Edition

Error handling

Error handling in a very important feature of Go because almost all Go functions return an error message or nil, which is the Go way of saying whether there was an error condition while executing a function. You will most likely get tired of seeing the following Go code not only in this book but also in every other Go program you can find on the internet:

if err != nil { 
    fmt.Println(err) 
    os.Exit(10) 
} 

Please do not confuse error handling with printing to error output because they are two totally different things. The former has to do with Go code that handles error conditions, whereas the latter has to do with writing something to the standard error file descriptor.

The preceding code prints the generated error message on ...