Master Golang: 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.