package main

// tickers are for when you want to do something repeatedly at regular
// intervals. Here's an example of a ticker that ticks periodically
// until we stop it.

import (
	"fmt"
	"time"
)

func main() {
	// Tickers use a similar mechanism to timers: a channel that
	// is sent values. Here we'll use the select builtin on the
	// channel to await the values as they arrive every 500ms
	ticker := time.NewTicker(500 * time.Millisecond)
	done := make(chan bool)

	go func() {
		for {
			select {
			case <-done:
				return
			case t := <-ticker.C:
				fmt.Println("Tick at", t)
			}
		}
	}()

	// Tickers can be stopped like timers. Once a ticker is stopped
	// it won't receive any more values on its channel.
	time.Sleep(1600 * time.Millisecond)
	ticker.Stop()
	done <- true
	fmt.Println("Ticker stopped")
}