(Go Lang) Switch (GBEN)

Go by Example

Example

  • Like C
  • switch / case / default
  • Multiple comma separated conditions per case
  • case on interface type
    • Interface types not yet introduced

// Here’s a basic switch.
i := 2
fmt.Print(“Write “, i, ” as “)
switch i {
case 1:
fmt.Println(“one”)
case 2:
fmt.Println(“two”)
case 3:
fmt.Println(“three”)
}
// You can use commas to separate multiple expressions in the same case
// statement. We use the optional default case in this example as well.
switch time.Now().Weekday() {
case time.Saturday, time.Sunday:
fmt.Println(“It’s the weekend”)
default:
fmt.Println(“It’s a weekday”)
}
// switch without an expression is an alternate way to express if/else logic.
// Here we also show how the case expressions can be non-constants.
t := time.Now()
switch {
case t.Hour() < 12: fmt.Println("It's before noon") default: fmt.Println("It's after noon") } // A type switch compares types instead of values. You can use this to // discover the the type of an interface value. In this example, the variable // t will have the type corresponding to its clause. 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") [/sourcecode] [sourcecode language="text" title="" ] Write 2 as two It's a weekday It's after noon I'm a bool I'm an int Don't know type string [/sourcecode]