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 (

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

  for i := 10; i >= 0; i-- {
 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 :


By Adam Ng

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