go Routine

go-routine.go

package main

import(
 "fmt"
 "time"
)

func f(from string) {
    for i := 0; i < 3; i++ {
	time.Sleep(1 * time.Millisecond)
        fmt.Println(from, ":", i)
    }
}

func main() {
    // executing the function in another goroutine concurrently with the main.
    go f("goroutine")

    // calling synchronously
    // processing in current main thread
    f("main")
    fmt.Println("done")
}