Example
Package fmt implements formatted I/O using format verbs:
%v // the value in a default format
%T // a Go-syntax representation of the type of the value
%s // the uninterpreted bytes of the string or slice
Format Functions
There are 4 main function types in fmt and several variations within.
fmt.Print("Hello World") // prints: Hello World
fmt.Println("Hello World") // prints: Hello World\n
fmt.Printf("Hello %s", "World") // prints: Hello World
Sprint
formattedString := fmt.Sprintf("%v %s", 2, "words") // returns string "2 words"
Fprint
byteCount, err := fmt.Fprint(w, "Hello World") // writes to io.Writer w
Fprint can be used, inside http handlers:
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hello %s!", "Browser")
} // Writes: "Hello Browser!" onto http response
Scan
Scan scans text read from standard input.
var s string
fmt.Scanln(&s) // pass pointer to buffer
// Scanln is similar to fmt.Scan(), but it stops scanning at new line.
fmt.Println(s) // whatever was inputted
Stringer Interface
Any value which has a String() method implements the fmt inteface Stringer
type Stringer interface {
String() string
}
