Go: Switch Statement

Expression Switch

Syntax:

switch optstatement; optexpression{
case expression1: Statement..
case expression2: Statement..
...
default: Statement..
}

Example:

package main 
import "fmt"
func main() { 
	switch color:=3; color{ 
	case 1: 
	fmt.Println("Red") 
	case 2: 
	fmt.Println("Blue") 
	case 3: 
	fmt.Println("Black") 
	case 4: 
	fmt.Println("Pink") 
	case 5: 
	fmt.Println("Orange") 
	default: 
	fmt.Println("Invalid") 
   } 	
} 

=> Output

Black

Type Switch

Syntax:

switch optstatement; typeswitchexpression{
case typelist 1: Statement..
case typelist 2: Statement..
...
default: Statement..
}

Example:

package main
import "fmt"
func main() {
   var value interface{}
   switch q:= value.(type) {
      case bool:
      fmt.Println("value is of boolean type")
      case float64:
      fmt.Println("value is of float64 type")
      case int:
      fmt.Println("value is of int type")
      default:
      fmt.Printf("value is of type: %T", q)
   }
}

Output:

value is of type: <nil>