Playing with goroutines

hello.go

package main

import "fmt"
import "time"

func main() {
  c := make(chan string, 3)
  go func() {
    c <- "Testing, "
  }()
  go func() {
    c <- "1... "
  }()
  go func() {
    c <- "2... "
  }()
  go func() {
    fmt.Println("In last callback.")
    time.Sleep(time.Second * 1)
    c <- "3! "
  }()

  fmt.Println("Executing loop...")
  for i := 0; i < 4; i++ {
    select {
    case msg := <-c:
      fmt.Println(msg)
    }
  }
}

output.log

% ./hello
Executing loop.
In last callback.
Testing,
1...
2...
3!