tickers.go

package main

import (
	"fmt"
	"time"
)

// Timers are for when you want to do something once in the future -
// 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.

// Ticker func illuste the use of tickers in go.
func Ticker() {

	// Tickers use a similar mechanism to timers:
	//  a channel that is sent values.
	// Here we’ll use the range builtin on the channel to iterate over the values as they arrive every 500ms.
	ticker := time.NewTicker(500 * time.Millisecond)
	go func() {
		for t := range 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. We’ll stop ours after 1600ms.
	time.Sleep(1600 * time.Millisecond)
	ticker.Stop()
	fmt.Println("Ticker stopped")

	// When we run this program the ticker should tick 3 times before we stop it.
}