go_is_tricky.go

package main

import (
    "fmt"
    "time"
)

func doNothing() {
    for {
    }
}

func doSomething() {
    for i := 0; i < 10; i++ {
        time.Sleep(time.Millisecond * 5)
        fmt.Printf("%d ms\n", i)
    }
}

func main() {
    for i := 0; i < 10; i++ {
        go doNothing()
    }

    doSomething()

    // What's the output of this code in the 5s duration?
    // What's the output when line 15 is commented out?
}