package main

import (
	"fmt"
	"time"
)

func main() {

	// The switch statement is like a multi-way if. It runs the first case whose value is equal to the condition.
	i := 2
	fmt.Print("Write ", i, " as ")
	switch i {
	case 1:
		fmt.Println("one")
		//no fallthrough, so the next case will not be executed
		//no break statement needed, unlike in C or Java
	case 2:
		fmt.Println("two")
	case 3:
		fmt.Println("three")
	}

	switch time.Now().Weekday() {
	// You can use commas to separate multiple expressions in the same case statement.
	case time.Saturday, time.Sunday:
		fmt.Println("It's the weekend")
	default:
		fmt.Println("It's a weekday")
	}

	t := time.Now()
	switch {
	case t.Hour() < 12:
		// Switch without an expression is an alternate way to express if/else logic.
		// Here we use it to show how the current hour falls into the first or second half of the day.
		fmt.Println("It's before noon")
	default:
		fmt.Println("It's after noon")
	}

	// In Go, a type switch is a construct that permits several type assertions in series.
	whatAmI := func(i interface{}) {
		switch t := i.(type) {
		case bool:
			fmt.Println("I'm a bool")
		case int:
			fmt.Println("I'm an int")
		default:
			fmt.Printf("Don't know type %T\n", t)
		}
	}
	whatAmI(true)
	whatAmI(1)
	whatAmI("hey")
}