Golang : Overwrite previous output with count down timer




Just a note for myself on how to create a count down timer and how to overwrite previous output. Very useful in launching vehicles to space. ( I hope so ).

The code below will overwrite its own previous output and pay attention to the comment about play.golang.org and terminal.

 package main

 import (
  "fmt"
  "time"
 )

 func main() {
  ticker := time.Tick(time.Second)
 fmt.Println("Counting down to launch...")

  for i := 10; i >= 0; i-- {
 <-ticker
 fmt.Printf("\x0cOn 10/%d", i) // use \x0c for play.golang.org
 //fmt.Printf("\rOn 10/%d", i) // use \r if you are running this in terminal
 
  }
  fmt.Println("\nWe have lift off!")
 }

Output :

See http://play.golang.org/p/UAS4o5x2ce

Reference :

https://mmcgrana.github.io/2012/09/go-by-example-timers-and-tickers.html





By Adam Ng

IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.


Advertisement