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
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