Control flow

switch

Go's `switch` looks like other languages', with one major difference: each `case` automatically stops after executing. No `break` needed, and no risk of accidentally falling through to the next case.

day := "mercredi"
 
switch day {
case "samedi", "dimanche":
	fmt.Println("Week-end")
default:
	fmt.Println("Jour de semaine")
}
// affiche "Jour de semaine"

A `case` can group several comma-separated values, as above for "samedi" and "dimanche". If you genuinely need the old fallthrough behavior (continue into the next case), the `fallthrough` keyword exists, but it's rarely used.

A `switch` with no expression after the keyword behaves like a more readable `if/else if`: each `case` holds its own boolean condition.

score := 82
 
switch {
case score >= 90:
	fmt.Println("A")
case score >= 75:
	fmt.Println("B")
case score >= 60:
	fmt.Println("C")
default:
	fmt.Println("D")
}
// affiche "B"