Golang Switch with a short statement

Similar to if, there can also be an initialization statement after the switch statement.

For example：

switch num1:=2; num1{
case 1:
	println("1")
case 2:
	println("2")
case 3:
	println("2")
}

The following example shows a slightly different usage from the above.

The following is a complete code example.

package main

import "fmt"

func main() {
    switch hour := 8; {
    case hour < 12:
        fmt.Println("Good morning!")
    case  hour < 17:
        fmt.Println("Good afternoon.")
    default:
        fmt.Println("Good evening.")
    }
}

Below is the program output:

Good morning!