Language Notes

Commas in Expression Case Statements

The use of comma in case statements work for expression:

x := 2

switch {
case x == 1, x == 2:
	fmt.Println("x < 3")
default:
	fmt.Println("x >= 3")
}

If x is 1 or 2, the x < 3 will be printed out.

Lookups On A Nil Map

You can do lookups on a nil map:

var xs map[string]string = nil
x, hasX := xs["hello"]

The result will simply be the zero value of the particular type. In this case x will be the empty string.