package main

import (
	"fmt"
	"time"
	"runtime"
)

func letsDefer(text string) {
	defer fmt.Println(text)
	fmt.Print("I have deferred: ")
}

func main() {
	fmt.Print("Go runs on ")
	switch os := runtime.GOOS; os {
	case "darwin":
		fmt.Println("macOS.")
	case "linux":
		fmt.Println("Linux.")
	default:
		fmt.Printf("%s.\n", os)
	}

	fmt.Println("When's Saturday?")
	today := time.Now().Weekday()
	switch time.Saturday {
	case today + 0:
		fmt.Println("Today.")
	case today + 1:
		fmt.Println("Tomorrow.")
	case today + 2:
		fmt.Println("In two days.")
	default:
		fmt.Println("Too far away.")
	}

	t := time.Now()
	switch {
	case t.Hour() < 12:
		fmt.Println("Good morning!")
	case t.Hour() < 17:
		fmt.Println("Good afternoon")
	default:
		fmt.Println("Good evening.")
	}

	letsDefer("Some stuff")

	fmt.Println("Counting...")
	for i:=0; i<10; i++ {
		defer fmt.Println(i)
	}
	fmt.Println("Done!")
}