How can I sleep for a variable duration using Go’s time.Sleep(d Duration)-function?

In all tutorials, How-To’s, etc. I just saw how people are using constant durations, such as time.sleep(3 * time.Second) (like here)

The only pattern I keep seeing is the one for decrementing an additional counter within a loop, such as (from here)

if s <= 0 {
    break
} else {
    fmt.Println(s)
    time.Sleep(1 * time.Second)  // wait 1 sec
    s--                          // reduce time
}

Is this really the only way to do it – using such a verbose boilerplate for such a simple task?

Is there really no support for simply writing time.Sleep(sec) or time.Sleep(sec * time.Duration) if sec holds a number value?

This seems so 1970’s-like ….

>Solution :

Duration is just a newtype’d int64, storing a nanoseconds count. All the multiplicative constants do is the scale from nanosecond to the specified time unit.

All you need to do is convert your runtime integer value to a Duration, then scale it to whatever your unit is:

time.Sleep(time.Duration(thing) * time.Second)

Because numeric constants are untyped, they will automatically instantiate whatever type is expected as long as that type has a numeric underlying representation.