Iota can be very useful when creating a bitmask. For instance, to represent the state of a network connection which may be secure, authenticated, and/or ready, we might create a bitmask like the following:
const (
Secure = 1 << iota // 0b001
Authn // 0b010
Ready // 0b100
)
ConnState := Secure|Authn // 0b011: Connection is secure and authenticated, but not yet Ready