Matching

package main

import (
    "fmt"
    "time"
)

func main() {

    i := 2
    fmt.Print("Write ", i, " as ")
    switch i {
    case 1:
        fmt.Println("one")
    case 2:
        fmt.Println("two")
    case 3:
        fmt.Println("three")
    }

    switch time.Now().Weekday() {
    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:
        fmt.Println("It's before noon")
    default:
        fmt.Println("It's after noon")
    }

    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")
}

// A match statement is a shorter way to write a sequence of if - else statements.
// When a matching branch is found, the following statement block will be run, and the final expression will be returned.
// The else branch will be evaluated when no other branches match.
os := 'windows'
print('V is running on ')
match os {
	'darwin' { println('macOS.') }
	'linux'  { println('Linux.') }
	else     { println(os) }
}

number := 1
s := match number {
	1    { 'one' }
	2    { 'two' }
	else { 
		println('this works too')
		'many' 
	}
}

// A match statement can also be used to branch on the variants of an enum by using the shorthand .variant_here syntax.
enum Color {
	red
	blue
	green
}
fn is_red_or_blue(c Color) bool {
	return match c {
		.red { true }
		.blue { true }
		else { false }
	}
}