Golang Notes - 13

Labels

• used in break, continue, goto statements

• not block scoped, live in another space

• used to terminate outer enclosing loops
  

func main() {
outer:
    for i := 0; i < 10; i++ {
        for j := 0; j < 10; j++ {
            fmt.Println(i, j)
            if i == j {
                break outer
            }
        }
    }
}

Goto
goto statement jump to label

func main() {
    i := 0
loop:
    if i < 10 {
        fmt.Println(i)
        i++
        goto loop
    }
}

it is not allowed to jump to label after new variable have been introduced

goto todo // Not valid
    x := 10
    fmt.Println(x)

todo:
   fmt.Println("todo")