Tour of Go 2.0

Switch with no condition

A switch with no condition is the same as switch true — each case is a boolean expression, and the first one that’s true wins.

This is a great pattern for replacing long if-else chains. It reads clearly top to bottom, and Go’s automatic break keeps it tidy. You’ll reach for this more than you’d expect.

main.go ▶ Run in Playground 
package main

import (
	"fmt"
	"time"
)

func main() {
	t := time.Now()
	switch {
	case t.Hour() < 12:
		fmt.Println("Good morning!")
	case t.Hour() < 17:
		fmt.Println("Good afternoon.")
	default:
		fmt.Println("Good evening.")
	}
}