Go switch statement
Go switch statement
```go package main
import ( “fmt” // “strconv” // “math” // “reflect” // “math” )
func simpleSwitch() { switch 212 { case 1: fmt.Printf(“one\n”) case 2: fmt.Printf(“two\n”) case 3: fmt.Printf(“three\n”) default: fmt.Printf(“something else!\n”)
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} }
func severalOptionSwitch() { switch 4 { case 1, 5, 10: fmt.Printf(“one, five and ten\n”) case 2, 4, 6: fmt.Printf(“two, four, six\n”) default: fmt.Printf(“another number\n”) } }
func initializerSwitch() { // tag syntax fmt.Printf(“\nStarting:\n\n”)
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switch i := 2 + 3; i {
case 1, 5, 10:
fmt.Printf("one, five and ten\n")
case 2, 4, 6:
fmt.Printf("two, four, six\n")
default:
fmt.Printf("another number\n")
}
}
func switchWithoutCondition() { // tagless syntax i := 10 switch { case i <= 10: fmt.Printf(“less than or equal to ten\n”) // be very carefull about this word “fallthrough” because // it is mindless and you take the responsibility // you do not use this very often!!! // … // fallthrough // … case i <= 20: fmt.Printf(“less than or equal to twenty\n”) default: fmt.Printf(“greater than twenty\n”)
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} }
func switchUsingInterface() { // var i interface{} = 2 // var i interface{} = 2.0 // var i interface{} = “two” // var i interface{} = [3]int{} var i interface{} = map[string]int{}
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switch i.(type) {
case int:
fmt.Printf("i is an int (%T)\n", i)
case float64:
fmt.Printf("i is float64 (%T)\n", i)
case string:
fmt.Printf("i is a string (%T)\n", i)
case [3]int:
fmt.Printf("i is an [3]int (%T)\n", i)
default:
fmt.Printf("i is another type (%T)\n", i)
} }
func exitSwitchEarly() { var i interface{} = 2 // var i interface{} = 2.0 // var i interface{} = “two” // var i interface{} = [3]int{} // var i interface{} = map[string]int{}
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switch i.(type) {
case int:
fmt.Printf("i is an int (%T)\n", i)
// if you do now want to execute code below
// within this matched "case" -> please use "break" statement
break
fmt.Printf("I do not want to execute this part i is an int (%T)\n", i)
case float64:
fmt.Printf("i is float64 (%T)\n", i)
case string:
fmt.Printf("i is a string (%T)\n", i)
case [3]int:
fmt.Printf("i is an [3]int (%T)\n", i)
default:
fmt.Printf("i is another type (%T)\n", i)
} }
func main() { // simpleSwitch() // severalOptionSwitch() // initializerSwitch() // switchWithoutCondition() // switchUsingInterface() exitSwitchEarly() }```