Go by Example: Timers

Go by Example : Timers

We often want to execute Go code at some point in the future, or repeatedly at some interval. Go’s built-in timer and ticker features make both of these tasks easy. We’ll look first at timers and then at tickers .
	`package main`
	`import ( "fmt" "time" )`
	`func main() {`
Timers represent a single event in the future. You tell the timer how long you want to wait, and it provides a channel that will be notified at that time. This timer will wait 2 seconds.	`timer1 := time.NewTimer(2 * time.Second)`
The `<-timer1.C`blocks on the timer’s channel `C`until it sends a value indicating that the timer fired.	`<-timer1.C fmt.Println("Timer 1 fired")`
If you just wanted to wait, you could have used `time.Sleep`. One reason a timer may be useful is that you can cancel the timer before it fires. Here’s an example of that.	`timer2 := time.NewTimer(time.Second) go func() { <-timer2.C fmt.Println("Timer 2 fired") }() stop2 := timer2.Stop() if stop2 { fmt.Println("Timer 2 stopped") }`
Give the `timer2`enough time to fire, if it ever was going to, to show it is in fact stopped.	`time.Sleep(2 * time.Second) }`

The first timer will fire ~2s after we start the program, but the second should be stopped before it has a chance to fire.

$ go run timers.go
Timer 1 fired
Timer 2 stopped

Next example: Tickers .