Go by Example: Switch

Switch statements express conditionals across many branches.

 
package main

import "fmt"
import "time"

func main() {

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")
    }
}

$ go run switch.go 
write 2 as two
it's the weekend
it's before noon

Next example: Arrays.

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